Release numbering

[Per Bothner]

Gabriel Dos Reis wrote:

> Or 6.0. Or whatever.  We never sworn carret diagnostics for 4.0.

It doesn't seem anyone really cares much about caret diagnostics.
At least I haven't seen a lot of help with --enable-mapped-location.

As a start, if somebody could test and fix regressions for c and c++,
and make sure it works for objc, it would free me to work on other
languages.  (Fortran looks easy, by the way.)
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/