#335780 by drewish: Actions define $image as passed by reference, but call_user_func doesn't support this.

some theme function fixes and move remove memory limit and toolkit requirements to imageapi gd and imageapi where they belong respectively.

Avoid a fatal error if the filefield module is disabled after setting up imagecache as the formatter.

remove presets from /admin/build/imagecache title

clean up height/width settings for imagecache_scale_and_crop to compensate
for auto scaling on 0 in imageapi.

#201849 by jpetso, Flush (remove) also hidden files. enable recursive delete to remove hidden files.
I modified slighty using dir() instead of opendir... supposedly a teensy bit faster.