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
I don't know. I'm curious what the risk would be. I just asked Luca about it. Here's the relevant javadoc btw:  http://www.orientechnologies.com/javadoc/latest/com/orientechnologies/orient/core/metadata/schema/OSchema.html#save()