Move EvtGenExtras models to EvtGen for master
Moved useful EvtGenExtras models to EvtGen (LHCBGAUSS-1478) for the master repository.
Replaced EvtB2MuMuMuNu with the more general EvtBLLNuL model (LHCBGAUSS-1487). Removed unneeded Fortran random number access classes.
This is equivalent to !357 (merged) and !343 (merged) combined for Sim09
Edited by Gloria Corti