Clean out old OGPX stuff
Add missing header guards
Crash fixes in model upload
Merge remote-tracking branch 'fairydust/master'
Attempt to cure stupid people being unable to untar properly over old versions without causing massive issues

(Gawd, that is not even proper installation process.... I need a drink)
Awesomeness, yayayay! (allows XML changes in indra/newview/skins/ to count for viewer running from a directory in indra on Windows)