Make FUNCTION a FUNCT alias (#1773)

This would get rid of the old FUNCTION, making it do what FUNCT
currently does instead, in order to improve the look and feel of
Rebol code. FUNCT would be retained for backwards compatibility.
See http://issue.cc/r3/1973 for details.
Replace FUNCT with FUNCTION

Improve code readability, and make FUNCT name optional.
Make CLOSURE a FUNCT for closures (#2002)

This would make CLOSURE like FUNCTION, gathering locals, to make
that locals gathering seem like the primary usage model for user
functions in Rebol, to make the language easier to use.

The old CLOSURE function is renamed to CLOS, to be like FUNC for
closures the way the function is already in practice.

See http://issue.cc/r3/2002 and http://issue.cc/r3/1973 for details.
Merge pull request rebol/rebol#109 (BrianHawley/wish-1973-function) into community

* BrianHawley/wish-1973-function:
  Make CLOSURE a FUNCT for closures (#2002)
  Replace FUNCT with FUNCTION
  Make FUNCTION a FUNCT alias (#1773)