FEAT: added FIND, INSERT and APPEND actions support for bitsets.
FEAT: factorized all bitset operation, extending all possible spec values to all actions.
FEAT: extended PICK and POKE actions specs with a boxed index argument (for deferred index processing).
FIX: many bitset issues fixed.
FIX: extra whitespaces removed.
Merge branch 'parse' of github.com:red/red into parse
FIX: wrong test for testing multiple bits defined in a block.