Had to rewrite all the mysqli->error/errno to mysqli->lastused because of the read/write splitting, shoud be working now
Reverted notifications code back to previous version
Added the lastused property to mysqlms, so that when calling the error/errno we know what was the lsat connection used, same for insert_id
* Default to standard DB if nothing is set
* Separate Accounts and Pool Workers shared DB
* Added shared News DB
* New config options added
* `$config['db']['shared']['accounts']`
* `$config['db']['shared']['workers']`
* `$config['db']['shared']['news']`
* [ADDED] New coin_addresses table to upgrade script and base file
* [MIGRATE] Move coin_address from accounts to coin_addresses table
* [UPDATE] Updated all classes/pages/scripts to use new coin address class
* [UPDATE] DB_VERSION 0.0.12
