New upstream release - 1.18
    
    - Remove spec file again (pbabinca)
    - Remove fedpkg-fixbranches as it isn't needed anymore (pbabinca)
    - Remove offtrac module as we don't use Trac for buildroot override (pbabinca)
    - Default name of executable if isn't possible to determine it (pbabinca)
    - Allow executable name to be used as key for configuration (pbabinca)
    - completion: Add mockbuild --root completion (ville.skytta)
    - completion: Assume fedpkg is installed if the completion is, no need to test
      (ville.skytta)
    - fix date in 1.11-2 changelog