More cleanup

doc/TODO

src/include/access/genam.h

src/include/access/hash.h

src/include/access/heapam.h

src/include/access/iqual.h

src/include/access/itup.h

src/include/access/nbtree.h

src/include/access/rtscan.h

src/include/access/tupdesc.h

src/include/access/xact.h

src/include/catalog/index.h

src/include/commands/defrem.h

src/include/commands/explain.h

src/include/commands/trigger.h

src/include/executor/execFlatten.h

src/include/executor/execdesc.h

src/include/nodes/execnodes.h

src/include/nodes/memnodes.h

src/include/nodes/primnodes.h

src/include/optimizer/_deadcode/xfunc.h