Two quotegrabs_db backends are now availble:
* Quotegrabs_Hashtable.pm: the original hashtable implementation
* Quotegrabs_SQLite.pm: the new SQLite implementation
Quotegrabs_SQLite.pm is now the default quotegrabs_db backend.
This was done to reduce the memory footprint of the bot by not needing to
keep the entire quotegrabs table in memory any longer.
A similiar change will be coming soon to the Factoids table as well as the
MessageHistory table.
