true-color version.
(PHP imagelayereffect) extended alpha-channel mixing effects for the
bundled GD library
@Added ImageColorMatch() and ImageLayerEffect() functions
@which work with the bundled GD library (ttoohey)
#if anybody objects we would need config stuuf in ligd otherwise but
#this way we can use other php functions...for example we could use
#php_error_docref....
This initial checkin has no changes to any of the libgd code so it can
be used as a basis for diffs. It also will not build currently because
of this. The PHP gd checks need to be incorporated along with a bit of
other config magic. It also shouldn't break the build and will only
take effect if you use --with-gd=php right now.
