Add ON COMMIT PRESERVE ROWS for temp tables (Gavin)

Allow cursors outside transactions using WITH HOLD (Neil)

Make MOVE/FETCH 0 actually move/fetch 0 (Bruce)

Add MOVE ALL to move to end of cursor (Bruce)

Cause FETCH 1 to return the current cursor row, or zero if at

beginning/end of cursor, per SQL spec (Bruce)

Have MOVE return 0 or 1 depending on cursor position (Bruce)