[PATCH] APIify pad functions

Attached patch puts all the essential pad functions into the API.  This is
to support parser plugins and things like Parse::Perl.  Mostly these
are interfaces that would survive a complete reimplemetation of the pad.
I marked as "may change" those which depend too closely on the current
AV-based implementation.

-zefram

• [PATCH] APIify pad functions by Zefram
• Re: [PATCH] APIify pad functions by Nicholas Clark
• Re: [PATCH] APIify pad functions by Zefram
• pp to c-stack (was: [PATCH] APIify pad functions) by Reini Urban
• Re: pp to c-stack (was: [PATCH] APIify pad functions) by Dave Mitchell
• Re: pp to c-stack (was: [PATCH] APIify pad functions) by Reini Urban
• Re: pp to c-stack (was: [PATCH] APIify pad functions) by Dominic Dunlop
• Re: pp to c-stack (was: [PATCH] APIify pad functions) by Joshua Juran
• Re: pp to c-stack (was: [PATCH] APIify pad functions) by Leon Timmermans