- Renamed to "Database" and ported to Scala.
 - Use indices from package index instead of java maps.
   These indices manage their own listeners and provide enumeration and test methods.
 - The database has two main tasks:
     1. Dispatch incoming requests to the appropriate index
     2. Process editscripts to update the nested indices.
 - Separated links targeting nodes (one-to-one) from links targeting primitives (one-to-many).
 - Use tags and types from truechange directly in the runtime to avoid translation from truechange to IncA at run time.