Commits on Dec 30, 2015

1. GROUP! as new default term for PAREN! …

   This changes the convention for Ren-C to use the name GROUP internally
   such that the macros are IS_GROUP() instead of IS_PAREN(), REB_GROUP
   instead of REB_PAREN, etc.  PAREN!, PAREN?, and TO-PAREN are kept
   as synonyms in the mezzanine, and a legacy switch to get TO-WORD
   of the datatype to say "PAREN!" is also included.
   
   (Long term the hope is to deprecate TO-WORD on datatypes, to eliminate
   their keyword form and use exemplars, along the lines of #[()] for
   a GROUP!/PAREN! so the word doesn't matter.)
   
   Making this change and type renames less of an issue in Ren-C is the
   new behavior of switch.  Previous concern over what name a type had
   was often driven by switch statements, where a switch on TYPE?/WORD
   could only have one answer regardless of what the alias one used was.
   With TYPE-OF no longer offering a word and switch being able to
   fetch values with get-words, the answer is better:
   
       switch/all type-of quote (a b c) [
           :paren! [print "This should work fine."]
           :group! [print "So will this."]
   
           paren! group! [
               print "**Neither** of these would work."
               print "You must compare to a datatype!"
           ]
       ]

   

   hostilefork committed Dec 30, 2015
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