[pLog-svn] aha: table change

[Jon Daley]

 	In upgrading my mother-in-law's blog from 0.3.2, I discovered why 
people haven't been able to get my category browser plugin to work.
 	The category_id field is not removed from the plog_articles table 
on upgrade, so my plugin only works on new installs.
 	It appears that we just need a "alter table plog_articles drop 
category_id", but now looking at it, I see there is an "old_status" 
column that is leftover too.  Probably someone (maybe me, since I have an 
upgraded blog and a new blog sitting next to each other) should go through 
each table and compare all of the columns.