Enh #1604: CDbCommandBuilder supports multiple insertion 

Added method "CDbCommandBuilder::createMultipleInsertCommand()" to suport multiple insertion.
"CSqliteCommandBuilder" and "COciCommandBuilder" override "createMultipleInsertCommand()" implementing thier own syntax.

Resolves #1604.
Migrated from #2274

Has been tested for MySQL and SQLite.
No idea, if Implementation for Oracle actually works. It need to be tested.