Lossless optimization of png image files, using `pngslim` and other tools.
Program graphics (compiled or included with software):
- Slimmed 453 B (~467 B kpacked), average ~8% saving for 5 files.
Documentation only artwork (distributed outside a program):
- Slimmed 112 KiB (~111 KiB kpacked), average ~30% saving for 11 files.
git-svn-id: svn://kolibrios.org@10025 a494cfbc-eb01-0410-851d-a64ba20cac60
