explicitly change dict/list values to int in cython wrapper

- makes it easier to directly load config files into API
restructured and extended python command line utility

- introduced main routine
- now accepts cmd line arguments when starting
- loads config from the psi46expert-style directories
- removed hard-coded config values
shell-helper script for python cmd line utility passes cmd line args now
fixed error in python cmdline tool config classes

- configs were defined statically for all classes; now members of class
Merge remote-tracking branch 'simon/cython_manual_interface' into cython_manual_interface
renamed python pxar cmdline module and helper script

- no longer pure "test" but provides all basic functionality