renamed usergroup into mountgroup

catalogue/Catalogue.hpp

catalogue/DummyCatalogue.cpp

catalogue/DummyCatalogue.hpp

common/CMakeLists.txt

common/dataStructures/Dedication.cpp

common/dataStructures/Dedication.hpp

common/dataStructures/MountGroup.cpp

common/dataStructures/MountGroup.hpp

common/dataStructures/User.cpp

common/dataStructures/User.hpp

scheduler/OStoreDB/OStoreDB.cpp

scheduler/Scheduler.cpp

scheduler/Scheduler.hpp

xroot_plugins/XrdCtaFile.cpp

xroot_plugins/XrdCtaFile.hpp