Added root namespace.
Further schema experimentation.
Tinkered with database query performance
Renamed RootPackage to RootNamespace.
Added start of Java code for Steamflake metamodel.
Added experimental STM utility.
Worked on STM correctness and performance.
Improved TransactionGarbageCollectionTest
Removed JSR-305 annotations.
Revised Steamflake meatmodel to use versioned state and remove implementation inheritance.
Added STM transaction context; renamed refactored a bit.
Updated metamodel & database with parent UUIDs; proper handling still TBD.
Added code to create root namespace during data migration.
Revised mechanism for parent UUID.