[Image-SIG] perspective method

[Laura & Edward Cannon]

A while back a read about, and even used, an experimental feature in
PIL 1.1.16 it was a new feature to the im.transform() method. as I
recall it was im.transform(size, PERSPECTIVE, data, filter) where data
was the transformation matrix. I was wondering what the status of this
feature was. It worked fine for me, and I wondered if it was still
considered experimental or if we could now consider it stable and add
it to the documentation.
Edward