mac-shallow-app uses c extensions again by searching libGR via `rpath` and
not `DYLD_LIBRARY_PATH`

-   Renamend *alternative cavities* to *center based cavities*
-   Added a switch to deactivate surface based cavities
-   Added a default value for the resolution (128)

before!)

- Visualization now uses the assigned context in the paint method
- Here-docs in build-flags are terminated correctly

are exported

additionally

creation and when the app folder is moved to another location

to the conda lib directory

On program startup prefixes are checked and fixed if needed

may clash with QWebEngine

application properly (prevents segmentation faults on Linux with Qt 5.6)

of no longer supported old style signal connects

-   libav changes the current working directory to tmp on linux
    -> created video files were saved at wrong locations
-   PIL import did not work for every PIL/pillow version

modules for python 3)