* both always return reliable false if result is empty

Doctrine_Connection_Sqlite::connect was creating functions every time it was called even if it was allready connected.

--no commit message

--no commit message

--no commit message

--no commit message

--no commit message

For example, for class User, the table name is entity

Fixed a bug in the nestedset implementation. When using single table inheritance all node instances need to use the same tree object. previously every subclass created it's own tree object which resulted in strange behaviour.