Add ivars and initial code in preparation to add an ID to Term B+ Tree map.
Ensure page cookies are the expected value when loading data from disk.
Added GTWMutableAOFBTree initBTreeWithKeySize:valueSize:pairEnumerator:updateContext: for bulk-creation of B+ Trees.
Fixed rewriting of Quad Store ID to Term indexes (re-mapping dictionary page ID values).
Added a simple parsed-page cache API to the GTWAOF protocol.