feat: bring back and adapt python bindings with rust core

* import python, try to adapt for rust

* add missing wrapper functions

* - try to write up how to build python bindings
- strike some unused functions from deltachat.h

* adjustments to make tox work

* try to run circle-ci with python build

* don't do docs

* running cargo test as well

* don't run cargo test anymore, that's done in other ci jobs

* also build docs

* don't run doxygen anymore

* subst C with Rust

* a try to get better wheels

Closes #41

python/tox.ini

@@ -0,0 +1,60 @@
+[tox]
+# make sure to update environment list in travis.yml and appveyor.yml
+envlist =
+    py27
+    py35
+    lint
+    auditwheels
+
+[testenv]
+commands = 
+    pytest -rsXx {posargs:tests}
+    pip wheel . -w {toxworkdir}/wheelhouse
+ 
+passenv = 
+    TRAVIS 
+    LD_LIBRARY_PATH 
+    CFLAGS
+deps = 
+    pytest
+    pytest-faulthandler
+    pdbpp
+
+[testenv:auditwheels]
+skipsdist = True
+commands = 
+    python tests/auditwheels.py {toxworkdir}/wheelhouse
+
+
+[testenv:lint]
+skipsdist = True
+usedevelop = True
+basepython = python2.7
+deps =
+    flake8
+    # pygments required by rst-lint
+    pygments
+    restructuredtext_lint 
+commands =
+    flake8 src/deltachat
+    flake8 tests/
+    rst-lint --encoding 'utf-8' README.rst
+
+[testenv:doc]
+basepython = python3.5
+deps =
+    sphinx==2.0.1
+    breathe
+
+changedir = doc
+commands =
+    sphinx-build -w docker-toxdoc-warnings.log -b html . _build/html
+
+
+[pytest]
+python_files = tests/test_*.py 
+norecursedirs = .tox 
+xfail_strict=true
+
+[flake8]
+max-line-length = 120