[2.0] DDC-341 - Added Composite Model-Set and 3 tests, fixed two bugs in SqlWalker with Composite Key support

[2.0] DDC-195 - Refactored Mapping Syntax again to be arrays in all annotations, xml and yaml drivers instead of parsing the fields in the AssociationMapping implementations.

[2.0] DDC-365 -  Added tests for several missing column types - also showing that decimals come and go correctly into the database.

[2.0] DDC-337 - Collections that are fetched through StandardEntityPersister and ordered are sorted by any given ORDER BY snippet. Now only the DQL Parser is missing in this regard.

[2.0][DDC-79][DDC-261] Fixed. Also fixed support for deleting objects by reference (getReference() + remove() + flush()) to effectively delete objects without loading them.

[2.0][DDC-284] Fixed. API polish and some convention over configuration simplifications for join columns and join tables.

[2.0] DDC-289 / DDC-264 - Added a Model and TestCase for OneToMany Unidirectional Assocations using a JoinTable and tested its defining feature (uniqueness).

[2.0] DDC-186 - Fixed SchemaTool indexes behaviour, changed a functional/integration model to use one index for test-coverage.

[2.0] DDC-115 - Fix for multiple class metadata instances because of classes being addressed with or without prepending namespace separator.

[2.0] DDC-84 - Add Mysql Platform unittests for incremental changes of the metadata for the schematool update function. Fixed some quirks in the Unit-Test suite alongside, Fixed changes of length in SchemaTool update - Changes in two files were missing.

[2.0] Fixed some known issues with inheritance, especially class table inheritance, like join columns not being selected.

[2.0] Applied fixes for character casing issues. Simplified inheritance mapping and improved handling of outer joins in Class Table Inheritance.

[2.0] More cleanups for recent lazy-loading implementation and minor object hydration improvements and cleanups. Collection refactoring part I for ticket #2352.

[2.0] Refined implementation and semantics of the merge and detach operations. General cleanups and API improvements. Added a testcase for detaching/serializing->unserializing->modifying->merging to demonstrate the transparent serialization.

[2.0] Moved locking tests into Functional namespace. Fixed several missing flush() calls in some functional association tests. Reordered DELETE statements for ecommerce model tests in OrmFunctionalTestCase in order to maintain referential integrity. Fixed issue with bi-directional self-referencing one-one associations. Some other small improvements and cosmetics. Small hydration performance improvement through inlining method call in UnitOfWork::createEntity().

[2.0] Fixed issue with self-referential one-to-many associations not being persisted correctly when IDENTITY key generation was used. Included now passing OneToManySelfReferentialTest.