Dropped support for very old Dev Tools installations that put documentation in "/Developer/ADC Reference Library". How this happened: I realized that in my latest changes I was mistakenly deciding when to instantiate AKOldDatabase. Then realized I could drop AKOldDatabase altogether since I only promise support for Xcode 3.x, which means I can assume docset bundles are used. So now there is only one AKDatabase class instead of it being an abstract base class. And this reduces confusion over the use of the word "old", which I (now consistently) use to mean something else regarding Dev Tools.

Moved some source files from the ClassDB directory to the GlobalClasses directory, fiddled with file groupings in the Xcode project.
Changes to the About window. Instead of outright disabling scrollability of the WebView, now removing elasticity from any scroll views it contains; this way, just in case Credits.html doesn't fit, it can still be scrolled. Edited Credits.html.