rash-0.2-bp156.3.50

- Replace transitional %usrmerged macro with regular version check (boo#1206798)

- prepare usrmerge (boo#1029961)

- Fix build due missed new racket-doc package

- Use contemporary tar invocation syntax.
- Avoid double tar when a simple cp works equally.
- Use faster find -delete.

- Compile launcher with optflags

- Initial package of rash, The Reckless rAcket SHell, version 0.2
  a shell based on the scheme Racket interpreter