[0000] Modified DB tree structure

* Removed 'characters' and 'realm' databases as they are handled by core
* Removed 'scripts' database as it is handled by scripts library
* Renamed '_extra' directory to 'utilities'
* Cleaned SQL scripts (first step)
* Initiated incremental revision number for DB updates
* Updated 'ReadMe' and 'Licence' files (first step)
* Changed DB login informations in 'mysql_info' to default values used
in mango config file