* Sync with GitHub:
- Fix size test in PSX Doom image format detection
- Changed vs2012 project to target v110_xp
- Hide next/prev image buttons on gfx entry panel if the entry only contains one IMAGEFORMATS_H
- Fix #33 and a few other similar issues
- Update affected map geometry on undo/redo moving vertices, fixes #32

git-svn-id: http://mancubus.net/svn/hosted/slade/trunk@1422 1ddb354d-3e0c-0410-833a-d70222086f97