Load only scheme files from scheme dir (previously loaded every file); return the added scheme (not boolean 'true'); comment tweaks
Fixed default schemes. Both contained PNGs (lithologies had many, symbols only one - Microfault.png) that fail to draw on PDF export of a Diagram. Couldn't find the root problem, but discovered a fix: "touching" the bad images using the OSX "sips" utility fixed all PNGs.
Version to 0.8.4