Wflow

Tested with PyInstaller 3.2.1, resulting exes can run

`wflow_rhine_sbm_nc` example without errors. Also all executables can

start without crashing (unless they do because of missing command line

arguments).

If UPX is available, compression will be applied. Even with compression

the size of the final dist folder is currently around 280 MB. This can

possibly be reduced by looking at what

[excludes](http://pyinstaller.readthedocs.io/en/stable/spec-files.html)

are possible to add.

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