* The Filesystemclasses: Changed 'bool Create( const Glib::ustring & device_path, const Partition & new_partition )'
to 'bool Create( const Partition & new_partition )'. Since i now use external tools for all filesystems, the partitionpath will suffice.
* Refined checks for functionality a bit. e.g. even if a filesystem can't be read, it's still possible to grow it
(but shrinking gets disabled). Also removed that stupid grow_only flag from Utils.h and reordered Win_GParted::Set_Valid_Operations()
* added support for jfs (create, copy, grow) and hfs (create, copy)
* fixed a bug in copying xfs filesystems.
* fixed a number of small bugs/annoying issues.