Expanded BlockID to 32b throughout H-Store. The upper 16b (at the moment)
are reserved for the AntiCacheID (ACID). ACID doubles as a level count so
the first AntiCacheDB is ACID = 1. The blockID change has been made across
the JNI boundary back up to the Java front end. The only place a blockID is
the same is in the AntiCacheDBs because these monotonically incraesing
numbers are used internal to the AntiCacheDB.
Added tests for the ACID and modified tests to work with the new blockId.
Migration is now fully tested in the EE.