Switch on Dbase32 encoding

[Jason Gerard DeRose]

This should be a non-disruptive change. The only place where this will have any effect is when you use Database.save() or Database.save_many() with a doc (or docs) that do *not* yet have a doc['_id']

In this case, microfiber will create an ID client-side with random_id() prior to make the CouchDB request. However, currently Dmedia and Novacut always create document IDs themselves, so as mentioned, this should have no effect on either.

This change will switch this implicit ID creation from using Base32 encoding to using Dbase32 encoding. For more info on the Dbase32 encoding, please see:

http://docs.novacut.com/dbase32/index.html