TTPAC material type icon compression

TTPAC material type icon compression

When cleaning up the images directory for TTPAC, I discovered
that the mattype icons had been saved with a poor compression
scheme and where taking up nearly 3MB, which was just too
high for a small set of icons.

I ran them through Photoshop CS5 and saved us a whopping 2.85MB
of disk space used by the images.  The entire lot decreased from
3MB to just 152KB.  Average icon size is now just about 1KB.

This should speed up load times when these images are displayed.

Signed-off-by: Michael Peters <mrpeters@library.in.gov>
Signed-off-by: Mike Rylander <mrylander@gmail.com>