Quantities Svn

serialization export code separated into *_export.h headers

reintroduced serialization of GeneratedVariable (Generic.h)

adapted all physical and general quantities to new serialization; including UniqueConstants

adapted all physical and general quantities to new serialization; including UniqueConstants

adapted all physical and general quantities to new serialization

another serialization implementation; deleted GeneratedVariable serialization and serialization code in Generic.h

another serialization implementation

reintroduction of serialization for UniqueConstant

deleted autoregister code from Variable.h and Constant.h

deleted useless UniqueConstant serialization