Added the "actor" property. Metakit backend not done (still not confident I know how it's supposed to work ;) Currently it will come up as NULL in the RDBMS backends for older items. The *dbm backends will look up the journal. I hope to remedy the former before 0.7's release. Fixed a bunch of migration issues in the rdbms backends while I was at it (index changes for key prop changes) and simplified the class table update code for RDBMSes that have "alter table" in their command set (ie. not sqlite) ... migration from "version 1" to "version 2" still hasn't actually been tested yet though.

Name: minimal
Description: This is an empty tracker - it must be customised for it to be
             useful! It only defines the bare minimum of information - the
             user database and the two default users (admin and anonymous).
             The rest is entirely up to you! Not recommended for first-time
             Roundup users (it's easier to tweak the Classic tracker).
Intended-For: Roundup experts who need a clean slate to start with.