Revision 260823

- functions that not are implemented since switching to rpm-4.6 now die
- internal cleanups
- srcrpm(): fix returning "...nosrc.rpm" instead of "...src.rpm" when needed
  (it always returned "...src.rpm" since rpm-4.9+)
- use rpm-4.6+ API, not rpm-4.4 compatibility one
  (fix some memleaks btw)