Further moved common structures out of the scheduler directory.

common/CMakeLists.txt

common/SecurityIdentity.cpp

common/SecurityIdentity.hpp

common/TapePool.cpp

common/TapePool.hpp

common/UserIdentityTest.cpp

common/VO.cpp

common/VO.hpp

common/archiveNS/StorageClass.cpp

common/archiveNS/StorageClass.hpp

common/archiveNS/Tape.cpp

common/archiveNS/Tape.hpp

common/archiveNS/TapeCopyLocation.cpp

common/archiveNS/TapeCopyLocation.hpp

common/exception/DiskException.cpp

common/exception/DiskException.hpp

common/exception/TapeException.cpp

common/exception/TapeException.hpp

common/priorities/DriveQuota.cpp

common/priorities/DriveQuota.hpp