- rework running of liveconfig tests

- better README reflecting how to use things, don't advertise
  run-integration-tests to only have one documented way
  and use less tools for rust-devs that just want to run
  python tests

- fix test skipping and get circle-ci to play along

- update docker related docs as well

ci_scripts/run_all.sh

@@ -37,6 +37,10 @@ if [ -n "$TESTS" ]; then
     export PYTHONDONTWRITEBYTECODE=1
 
     # run tox
+    # XXX we don't run liveconfig tests because they hang sometimes
+    # see https://github.com/deltachat/deltachat-core-rust/issues/331
+    unset DCC_PY_LIVECONFIG
+
     tox --workdir "$TOXWORKDIR" -e lint,py27,py35,py36,py37,auditwheels
     popd
 fi