forward-comment re-implemented

[Stephen J. Turnbull]

Aidan Kehoe writes:
 > 
 >  Ar an triochadú lá de mí Eanair, scríobh Andreas Roehler: 
 > 
 >  > BTW a re-implementation exists already in newcomment.el: comment-forward
 >  > 
 >  > docu says:
 >  > 
 >  > "Skip forward over N comments.
 >  > Just like `forward-comment' but only for positive N
 >  > and can use regexps instead of syntax."
 >  > 
 >  > Also doesn't move backward, what was needed too.
 >  > 
 >  > So far
 > 
 > So if we replaced the guts of comment-forward with your
 > implementation, would that suit you? I suppose we could replace any
 > keyboard bindings to forward-comment with it.

Please don't do this without grepping the core and the packages for
use of forward-comment in performance-critical applications like
font-lock and cc-mode.