WIP SQLite backend

libs/middletier/AdminHost.cpp

libs/middletier/AdminHost.hpp

libs/middletier/AdminUser.cpp

libs/middletier/AdminUser.hpp

libs/middletier/ArchivalJob.cpp

libs/middletier/ArchivalJob.hpp

libs/middletier/CMakeLists.txt

libs/middletier/FileSystemStorageClasses.cpp

libs/middletier/LogicalLibrary.cpp

libs/middletier/LogicalLibrary.hpp

libs/middletier/MigrationRoute.cpp

libs/middletier/MigrationRoute.hpp

libs/middletier/MockAdminHostTable.cpp

libs/middletier/MockAdminUserTable.cpp

libs/middletier/MockArchivalJobTable.cpp

libs/middletier/MockLogicalLibraryTable.cpp

libs/middletier/MockMigrationRouteTable.cpp

libs/middletier/MockTapePoolTable.cpp

libs/middletier/MockTapeTable.cpp

libs/middletier/RetrievalJob.cpp