REIVEW: [NX-518] Orient database manager

This PR addresses the following issues:

https://issues.sonatype.org/browse/NX-518
https://issues.sonatype.org/browse/NX-519
https://issues.sonatype.org/browse/NX-542
schema.save should really be marked as @Deprecated in orientDB's code...javadocs say it has been a no-op for some time (was required in much older versions)