[2.0] Fixed E_NOTICE being throwing when ->getSingleScalarResult() is called and no result is found. Added coverage for this and also for multiple result (NonUniqueResultException).

Fixing ensure-production-settings task to not throw an exception and instead use the Output object to output an error

Fixing issue with orm:convert-mapping task and dest-path that does not exist yet as well when reverse engineering from-database

[2.0][DDC-493] Added coverage to DDC-493 and optimized DDC-513 unit tests. Previous commit fixed the issue.

DDC-510 Move Exception for no Metadata Driver from Configuration to EntityManager::create, commit missing MetadataFilter

DDC-510 - Refactored Metadata Driver to be an required option, even for Annotations - allowing to use the specified paths in ORM Tooling Commands

DDC-502, DDC-507 - Changes to how Annotation Metadata Driver is handled in SchemaTool Command, Specifiying Mapping paths is now required for this to work.

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

[2.0] DDC-342 - Throw Exception with notice in case of Many To Many relation pointing to Joined Inheritance Hierachy until this feature is completed