Tweaked the grouping of files -- AKDocSetIndex can be used independently of AKDatabase.
Added a couple of getter methods that I ended up not using, but might be useful later.
Minor changes to the wording of Dev Tools info.
Added a comment showing a useful way to test the case when a docset doesn't have local HTML files and needs to be downloaded.
Added a sanity check for whether the docset needs to be downloaded. If so, we now inform the user.
Updated web pages for 0.993.
Cleaned up release scripts a bit. Added an akduntag script since I keep tagging prematurely and then having to untag and retag. Added a sanity check to confirm we're in an AppKiDo repository when we're supposed to be.