All the commits in this set were either doc commits or had already been cherry
picked into GPDB so barring a small pg_sleep() diff in the tests, another merge
without side effects.

 Conflicts:
	configure
	doc/src/sgml/Makefile
	doc/src/sgml/docguide.sgml
	src/backend/access/nbtree/nbtinsert.c
	src/backend/postmaster/postmaster.c
	src/backend/utils/adt/selfuncs.c
	src/port/exec.c