python => python2 in development/ and tests/ and some dev scripts

If you want to run this on debian (which as far as i know is pretty much
the only problematic distribution here), you should be accustomed to the
change necessary by now.
python => python2 in main python files (run_uh and server)

Not including mac setup and build files.
Remove unused and outdated install script

No idea whether the dependency lists in there are accurate still, but
since nobody used this anyways i figure removing is the better option.