* Remove some dead (commented out) & dirty code from multiint.c which used JPEG code (image_load_from_jpg)
* Remove dead (commented out) code from screen.c which used JPEG code (function static GLuint image_create_texture)
* Remove unused backdrop types from pieblitfunc.[ch]
* Convert last JPEG files into PNG, add a "comment" property on those: "All of these are converted from JPEG files, so this is JPEG quality."
git-svn-id: svn+ssh://svn.gna.org/svn/warzone/trunk@1490 4a71c877-e1ca-e34f-864e-861f7616d084