First tests for basic collection implementation. First experimental use of closures (Currently commented out, because the svn server makes a syntax check against 5.2.x).

added missing annotation driver class. small refactorings. added first ClassMetadata serialization tests.

--no commit message

--no commit message

Added getters to AST. Removed Production::__call. Added visitor support to AST. (guilherme: dont shoot me yet :-). visitor support doesnt hurt even if we do not use it for SQL generation). Lots of other things.

Merged all identity maps into one in the unitofwork. identity map now properly works with hierarchies.