Provide method to get the versions of GINsim, GINsim-python, biolqm

[jonrkarr]

The version of the package is typically stored in the package (e.g., ginsim.__version__). It would also be helpful to be able to get the active versions of the GINsim and bioqlm.

• biolqm
• GINsim
• GINsim-Python

[pauleve]

Having access to a version number for GINsim would be very useful, especially to distinguish among all the beta versions..
@aurelien-naldi can you add this easily? For beta versions you could append the YYYYMMDD date or increase a release number..

I'll restore the __version__ attribute for the python package.