DBAL 205 Fix

[WIP] Drizzle Support

Fix DBAL-196

Unique key name isn't correctly set - DDC-1603

[DBAL-206] OraclePlatform causes problems with more schemas with same table names

[DBAL-204] Full Schema Namespacing Support

Added a missing use statement

Fix for nasty bug that happens when there are 2 or more schemas with tables that have the same name. Since all the AbstractPlatform classes get only the table name using ALL_* schema tables is dangerous because the owner is never supplied.

The other possible solution is to use the ALL_* tables but in each of the methods to fetch the owner before actualy querying them.

[DBAL-204] Sane refactoring of the previous idea. Removed a bunch of code again and implemented proper schema namespacing. Also got the wording right (hopefully) and fixed the algorithms.

replace unneeded RegEx

Prevent message "Call to undefined function InvalidArgumentException()"