Krita resources such as filters and colour models.
* Small optimization: if we create a black, transparent image, use the
default tiles and don't create tiles for the entire image size.
* Fix in kis_iterator_pixel: advance the selection iterator with just as much
as the pixel iterator.
* Added filter test to the performance tests -- these make Krita run out of
memory, though.

svn path=/trunk/koffice/; revision=400186