[atomic-maven-plugin] Don't process @Atomic annotations on _Base classes

  * No backend generates them in _Base classes, so it's pointless to process them
[jvstm-ojb] Removed IdInternal, OID is now the primary key.
[dml-maven-plugin] Cleaned up
[dml-compiler] DOAllocator no longer requires special constructors

  * Through the use of the ReflectionFactory class, we can instantiate
    domain objects without the need of special constructors on the concrete
    classes, invoking the backend's Abstract DO's constructor directly
Deprecated DmlPostProcessors, as they are no longer required