Squashed commit of the following:

commit 6bc5d1b90e
Author: holger krekel <holger@merlinux.eu>
Date:   Sun Jul 21 22:56:37 2019 +0200

    fix fmt

commit 197d94ad9d
Merge: 7ce337c 686678c
Author: holger krekel <holger@merlinux.eu>
Date:   Sun Jul 21 22:51:16 2019 +0200

    Merge remote-tracking branch 'origin/master' into eventlogging

commit 7ce337c6d0
Author: holger krekel <holger@merlinux.eu>
Date:   Sun Jul 21 22:44:27 2019 +0200

    left-over error logging

commit 10148d2e43
Author: holger krekel <holger@merlinux.eu>
Date:   Sun Jul 21 22:03:17 2019 +0200

    ignore non-utf8 parts of header fields (add comment why it shouldn't happen)
    don't throw error if no sql rows are returned

commit 69dc237ee3
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Sun Jul 21 12:56:04 2019 +0200

    fix(receive_imf): remove recursive sql call

commit df5464ea80
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Sat Jul 20 17:05:24 2019 +0200

    fix: blocked is an optional value

commit e4bf9956a5
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Sat Jul 20 16:50:56 2019 +0200

    fix(msg): handle optional in_reply_to

commit d353d9d9d8
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Sat Jul 20 16:17:25 2019 +0200

    fix(chat): remove recursive sql usage

commit 1ad45ed4d6
Author: holger krekel <holger@merlinux.eu>
Date:   Sat Jul 20 15:14:11 2019 +0200

    fix rust fmt

commit 496e980a17
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Sat Jul 20 14:34:20 2019 +0200

    use forked rusqlite

commit fa09e46ed9
Author: holger krekel <holger@merlinux.eu>
Date:   Sat Jul 20 12:37:51 2019 +0200

    another pace where we might (and in my case did) get invalid utf8

commit d6de420b9a
Author: holger krekel <holger@merlinux.eu>
Date:   Sat Jul 20 12:30:48 2019 +0200

    fix some string issues, introduce to_string_lossy such that to_string() continues to panic on non-utf8

commit 38eb708db8
Author: holger krekel <holger@merlinux.eu>
Date:   Sat Jul 20 01:17:53 2019 +0200

    for now make to_string() less strict as we often don't want to crash the whole app just because some non-proper utf8 came in (through a message we can't neccesarily congtrol)

commit 7a59da5f8f
Author: holger krekel <holger@merlinux.eu>
Date:   Fri Jul 19 22:48:39 2019 +0200

    fix linting

commit f13a1d4a2f
Author: holger krekel <holger@merlinux.eu>
Date:   Fri Jul 19 22:46:58 2019 +0200

    fix some test flakyness

commit 7b3a450918
Author: holger krekel <holger@merlinux.eu>
Date:   Fri Jul 19 22:35:07 2019 +0200

    - fix saved_mime test which broke to improper conversion of
      imf_raw_not_terminated
    - some cargo.toml updates no clue where they come from
    - log Message-ID for received messages

commit 169923b102
Author: holger krekel <holger@merlinux.eu>
Date:   Fri Jul 19 12:31:22 2019 +0200

    formatting

commit 42688a0622
Author: holger krekel <holger@merlinux.eu>
Date:   Fri Jul 19 12:24:56 2019 +0200

    remove some print statements

commit 35f3c0edd1
Merge: e7a2362 f58b1d6
Author: holger krekel <holger@merlinux.eu>
Date:   Fri Jul 19 10:25:21 2019 +0200

    Merge branch 'master' into eventlogging

commit e7a236264a
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Thu Jul 18 23:20:20 2019 +0200

    print invalid strings

commit aaa5b820d9
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Thu Jul 18 23:12:35 2019 +0200

    cleanup

commit e7f0745010
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Thu Jul 18 23:03:57 2019 +0200

    reduce direc usage of CString

commit c68e7ae14e
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Thu Jul 18 22:47:47 2019 +0200

    audit use of to_cstring and fix ub

commit 618087e5a7
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Thu Jul 18 21:38:52 2019 +0200

    fix(imap): body ptr lifetime

commit 245abb8384
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Thu Jul 18 19:44:10 2019 +0200

    remove debug

commit a3e1042001
Author: dignifiedquire <dignifiedquire@users.noreply.github.com>
Date:   Thu Jul 18 18:30:54 2019 +0200

    fix some things, add more debugging statements

commit 7b7ce9348f
Author: holger krekel <holger@merlinux.eu>
Date:   Thu Jul 18 15:11:57 2019 +0200

    fix python lint issues

commit 7a4808ba0d
Author: holger krekel <holger@merlinux.eu>
Date:   Thu Jul 18 14:35:54 2019 +0200

    cargofmt

commit 8f240f7153
Author: holger krekel <holger@merlinux.eu>
Date:   Thu Jul 18 14:03:57 2019 +0200

    (dig,hpk) pull out job collection from sql query/lock logic

commit 7d0b5d8abb
Author: holger krekel <holger@merlinux.eu>
Date:   Thu Jul 18 12:52:02 2019 +0200

    remove print statements and fix a crash

commit ee317cb1b5
Author: holger krekel <holger@merlinux.eu>
Date:   Thu Jul 18 11:38:10 2019 +0200

    fix some merge issues

commit 7b736fe635
Author: holger krekel <holger@merlinux.eu>
Date:   Thu Jul 18 11:16:38 2019 +0200

    (dig,hpk) add test and fix for wrong dbs

commit c7db15352a
Merge: 0b37167 0c5015d
Author: holger krekel <holger@merlinux.eu>
Date:   Thu Jul 18 09:59:44 2019 +0200

    Merge branch 'master' into eventlogging

commit 0b37167be8
Author: holger krekel <holger@merlinux.eu>
Date:   Thu Jul 18 00:06:05 2019 +0200

    address @dignifiedquire comments

commit 5cac4b5076
Author: holger krekel <holger@merlinux.eu>
Date:   Wed Jul 17 12:47:22 2019 +0200

    remove spurious print

commit 475a41beb3
Author: holger krekel <holger@merlinux.eu>
Date:   Wed Jul 17 12:31:12 2019 +0200

    address @dignifiedquire rustyness comment and fix changelog

commit ad4be80b4e
Author: holger krekel <holger@merlinux.eu>
Date:   Wed Jul 17 10:25:25 2019 +0200

    make smtp/imap connect() return bool instead of c-int

commit 8737c1d142
Author: holger krekel <holger@merlinux.eu>
Date:   Wed Jul 17 09:26:33 2019 +0200

    cleanup some parts, add comments

commit 964fe466cc
Author: holger krekel <holger@merlinux.eu>
Date:   Tue Jul 16 20:05:41 2019 +0200

    wip-commit which passes all tests with proper finalization

commit 43936e7db7
Author: holger krekel <holger@merlinux.eu>
Date:   Tue Jul 16 16:17:42 2019 +0200

    snapshot of my current debugging state

commit 0e80ce9c39
Author: holger krekel <holger@merlinux.eu>
Date:   Tue Jul 16 12:57:19 2019 +0200

    more aggressively skip perform API when threads are closing

commit c652bae68a
Author: holger krekel <holger@merlinux.eu>
Date:   Tue Jul 16 12:06:05 2019 +0200

    intermediate wip commit

commit bc904a495d
Author: holger krekel <holger@merlinux.eu>
Date:   Tue Jul 16 11:18:56 2019 +0200

    add some logging, and a more precise teardown for online python tests

commit 8d99444c6a
Author: holger krekel <holger@merlinux.eu>
Date:   Tue Jul 16 00:22:12 2019 +0200

    fix std

commit 9dab53e0af
Author: holger krekel <holger@merlinux.eu>
Date:   Tue Jul 16 00:20:54 2019 +0200

    rustfmt

commit 360089ac74
Author: holger krekel <holger@merlinux.eu>
Date:   Tue Jul 16 00:03:49 2019 +0200

    remove some debugging

commit e892c5cf4d
Author: holger krekel <holger@merlinux.eu>
Date:   Mon Jul 15 23:31:30 2019 +0200

    fix test for events

commit 9ad4c9a6fe
Author: holger krekel <holger@merlinux.eu>
Date:   Mon Jul 15 22:51:57 2019 +0200

    wip try test that we see INFO events from the core

examples/repl/main.rs

@@ -398,11 +398,10 @@ fn main_0(args: Vec<String>) -> Result<(), failure::Error> {
 
     if args.len() == 2 {
         if 0 == unsafe {
-            dc_open(
-                &mut context,
-                to_cstring(&args[1]).as_ptr(),
-                0 as *const libc::c_char,
-            )
+            let a = to_cstring(&args[1]);
+            let res = dc_open(&mut context, a, 0 as *const _);
+            free(a as *mut _);
+            res
         } {
             println!("Error: Cannot open {}.", args[0],);
         }
@@ -482,11 +481,10 @@ unsafe fn handle_cmd(line: &str, ctx: Arc<RwLock<Context>>) -> Result<ExitResult
     let mut args = line.splitn(2, ' ');
     let arg0 = args.next().unwrap_or_default();
     let arg1 = args.next().unwrap_or_default();
-    let arg1_c = to_cstring(arg1);
-    let arg1_c_ptr = if arg1.is_empty() {
+    let arg1_c = if arg1.is_empty() {
         std::ptr::null()
     } else {
-        arg1_c.as_ptr()
+        to_cstring(arg1)
     };
 
     match arg0 {
@@ -559,13 +557,15 @@ unsafe fn handle_cmd(line: &str, ctx: Arc<RwLock<Context>>) -> Result<ExitResult
         "joinqr" => {
             start_threads(ctx.clone());
             if !arg0.is_empty() {
-                dc_join_securejoin(&ctx.read().unwrap(), arg1_c_ptr);
+                dc_join_securejoin(&ctx.read().unwrap(), arg1_c);
             }
         }
         "exit" => return Ok(ExitResult::Exit),
         _ => dc_cmdline(&ctx.read().unwrap(), line)?,
     }
 
+    free(arg1_c as *mut _);
+
     Ok(ExitResult::Continue)
 }