[2.0][DDC-164][DDC-165] Fixed. Cleaned up ManyToManyMapping. Cleaned up identifier handling and handling of composite identifiers in some places.

DDC-127 - Special Case with invalid input parameter in DQL leads to php notice instead of an exception.

DDC-126 - Make Query, NativeQuery Fluent-Interfaces for all their set Methods, renamed setExpireQueryCache() and setExpireResultCache() to expireQueryCache() and expireResultCache(). Updated UPGRADE_TO_2_0 document accordingly.

DDC-127 - Enhance IterableResult by making it implement the Iterator interface, wrote a unit-test for this scenario, also added some additional tests for special cases in the query api that lead to exceptions.

[2.0][DDC-158] Small correction to previous patch. Moved takeSnapshot up in order not lose new objects that were added before initialization.

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

[2.0] Fix Fatal errors in unused classes that crash the testsuite when running PHPUnit with coverage-whitelisting of complete Doctrine directory.

[2.0] Fix Tab Formating in ParserResult class, added doc-comments and fixed a missing variable initialization error for certain query special cases.

[2.0] DDC-109 - Fixed another warning in SchemaTool with inverse join columns and unique constraints.

[2.0] DDC-114 - Extend SchemaTool Drop functionality to optionally drop the complete database. Additionally a filter against all existing table is applied to avoid errors due to dropping non-existant tables. Updated Schema-Tool CLI command with optional calls --drop=database --drop=metadata but kept original --drop which defaults to "metadata". Updated documentation.

[2.0] DDC-115 - Proper fix of global namespace problem was in the ClassMetadataInfo, a namespace plus seperator was appended for reasons of shortcuts. However this broke associations in global namespace. Changes to ClassMetadataFactory were reverted and fix plus tests applied to ClassMetadataInfo.