This is a purge of dead and unused code. The major thing with this is the removal of all original DATabase features. They might be resurrected in the future but , for now, it would need a full rewrite to make sense. Nobody uses it either, so it shouldn't be missed.
Taking a cue from RomVault and GordonJ, I'm including the Zlib code as converted by DotNetZip as well as creating a couple slightly more maleable structures for writing archives.
This set of changes is the start of turning over to a Hash based system instead of a Rom/Dat based system. It's a long process but it will be worth it in the end.
