Add length to database primary keys.
Tweak some of the itembans code to be less inefficient.
Removed a chunk of code from the buff code that prevented users from being buffed with a buff that comes from an item.  This code seemed to cause max cpu usage when being disabled.  I don't think this code is useful, but I leave that to people who own servers.  IMO all buff code should be removed.
Merge branch 'general-devel' of https://github.com/NyxStudios/TShock into general-devel