- implement page buffering in PageChannel
* need to implement logical flushing in update code (startUpdate/finishUpdate)
- add typed getter methods to PropertyMap
+
+Index add (fk impl)
+- Database.addIndex(IndexBuilder) - use TableCreator internal
+ - add indexes separately from adding fk info,
+ - need to populate index after creation! populate first, then add?
+ - add relationships
+- flush all non-system tables from DbImpl._tableCache (references to old table
+ impls)