Rotate Case command suggestion

[Scott Layson <X.GYRO@MIT-OZ>]

Everyone points out that the argument should be the number of words to
operate on.  Well, that's logical and philosophically consistent with
the rest of the editor, but I suspect it isn't very useful.  I liked
my suggestion of having arguments modify the definition of a "word",
e.g., as if Atom Word Mode were on.  However, the chances of anyone
but me ever using that may be slim -- after all, a user will bother to
learn only so many special-case hacks.  (Do @i<you> ever use c-U c-U
c-Space?)  So perhaps consistency should take precedence.

Another suggestion: if there's a region, the command should operate on
the whole region, and leave it turned on.  I, for one, much prefer
marking things with the mouse to counting words.

-- Scott