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Parents and children of check-in [e963bed0]

Change the OP_Rowid opcode so that a deferred OP_Seek is pending, it simply pulls the rowid from the deferred seek target and does not actually move the cursor or do a seek. Other where.c cleanups. (CVS 6536) (check-in: 1c508a99 user: drh tags: trunk)
Remove the rowhash object from the code. Rowset now fills its role. (CVS 6535) (check-in: e963bed0 user: drh tags: trunk)
Extend the Rowset object to contain all the capabilities of Rowhash in addition to its legacy capabilities. Use Rowset to replace Rowhash. In addition to requiring less code, This removes the 2^32 result row limitation, uses less memory, and gives better bounds on worst-case performance. The Rowhash implementation has yet to be removed. (CVS 6534) (check-in: b101cf70 user: drh tags: trunk)