Post-install skipped after changes to pyinstaller script

[bitsgalore]

This probably related to the fact that iromlab now uses wheels, see:

pypa/packaging-problems#64

Suggestion here:

https://stackoverflow.com/questions/24263774/post-install-script-after-installing-a-wheel#comment41929643_24749871

First step would then be to create a separate config script and include that in the package.

[bitsgalore]

First step: moved post-installation code to a separate script that needs to be executed by the user after installation. While at it also got rid of copying the executables of the wrapped tools to the Window User dir, as they can be accessed without problems from within the package:

911470b

Not ideal b/c user needs to dig down into the Python/Scripts directory to find the configuration exe, but at least it works ...

TODO:

• Update documentation on this
• Make this look less rough around the edges (weird MessageBox behaviour)

[bitsgalore]

All done!

• Rewrite of configuration script: 6cf19c4
• Update docs: 6cf19c4