[2.0][DDC-92] Fixed. Patch provided by Christian Heinrich. [DDC-274] Started some method renaming. [DDC-142] Fixed (join column names and discriminator column names dont support quoting) [DDC-258] Fixed.

[2.0][DDC-362] Fixed missing namespace declaration on __call method of EntityRepository. Thanks Marcel Walter for the patch.

[2.0][DDC-158] Fixed. Collections did not take snapshots after lazy initialization leading to wrong change sets.

[2.0][DDC-22] Fixed. Also cleaned up association handling. More to come: exception refactorings, proxy simplifications (single proxy class, not two).