Merge dev branch into pro

See merge request !7

Added assignement operator to MpdEvent

See merge request !6

small correction of main macros for CDASH; MPDScheduler update; correct coefficient file closing and deleting of TFile pointer in MpdTPCpid class

Freezout storage

There is known problem with storing "extra" branches by generator class. Standard registering via FairRootManager doesn't work corretly with Geant4. I created task that add itself for reconstruction chain. So we can now store freezout information by using this class. Storing of this information for vHLLE model is also implemented.

See merge request !5

update to the newer version of FairRoot used in BmnRoot in order to use different sources; many corrections to exclude errors concerned with this update