changed common data structures from classes to plain structs

catalogue/SqliteCatalogue.cpp

catalogue/SqliteCatalogueTest.cpp

common/CMakeLists.txt

common/dataStructures/AdminHost.cpp

common/dataStructures/AdminHost.hpp

common/dataStructures/AdminUser.cpp

common/dataStructures/AdminUser.hpp

common/dataStructures/ArchiveFile.cpp

common/dataStructures/ArchiveFile.hpp

common/dataStructures/ArchiveFileSummary.cpp

common/dataStructures/ArchiveFileSummary.hpp

common/dataStructures/ArchiveJob.cpp

common/dataStructures/ArchiveJob.hpp

common/dataStructures/ArchiveRequest.cpp

common/dataStructures/ArchiveRequest.hpp

common/dataStructures/ArchiveRoute.cpp

common/dataStructures/ArchiveRoute.hpp

common/dataStructures/CancelRetrieveRequest.cpp

common/dataStructures/CancelRetrieveRequest.hpp

common/dataStructures/DRData.cpp