bff4-1-bp160.1.12

- Use %patch -P N instead of deprecated %patchN.

- Remove obsolete Groups tag (fate#326485)

- added license-clarification.txt (bnc#761551) and updated
  license tag
- updated bff4.c
- renamed arg.patch -> bff4-arg.patch and added patch info
- improved and cleaned-up spec file

- Remove redundant tags/sections from specfile

- new package