[master] Add possibility to create Gaudi options in dirac-bookkeeping-get-files

This was requested by users in order to not have to use ganga or the GUI to create options files...

It uses the LHCBBKKDBClient that uses in turn the LHCbBookkeepingManager. That module was changed in order to remove the possibility to create non-python options files (as those were anyway a mixture of old options and python!), and only use the IOHelper() (getting rid of legacy options format)

GangaDataFile also using LHCBBKKDBClient and getting rid of all legacy options files format... For the time being the persistency can still be provided from the workflow, but if absent it will be obtained from the BK.

getRunInformations() was added to BookkeepingClient.py in order to allow the run number to be any type (casted to long)