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Parents and children of check-in [3c1ae447]

Seek past NULLs in a top-constrained search. Avoid checking for NULLs in the body of the search. (check-in: e07a32f3 user: drh tags: trunk)
Better support for MinGW 4.x. (check-in: e1472307 user: mistachkin tags: mingw4x)
Reduce the number of cases where it is necessary to check for NULL after the loop terminating condition. (check-in: 3c1ae447 user: drh tags: trunk)
Add OP_IdxGT and OP_IdxLE as distinct opcodes. Formerly these operations where done using OP_IdxGE and OP_IdxLT with the P5 flag set. But VDBE code is easier to read with distinct opcode names. Also change OP_SeekGe to OP_SeekGE, and so forth, so that the capitalization is consistent. The whole point of this change is to improve the readability of VDBE listings. (check-in: b6bea903 user: drh tags: trunk)