Add files from parent branch HEAD:

Add files from parent branch HEAD:
	src/backend/catalog/pg_proc.c
	src/backend/commands/comment.c
	src/backend/commands/explain.c
	src/backend/executor/execJunk.c
	src/backend/optimizer/path/allpaths.c
	src/backend/optimizer/plan/createplan.c
	src/backend/rewrite/rewriteManip.c
	src/backend/utils/adt/not_in.c
	src/backend/utils/adt/tid.c
	src/include/parser/parsetree.h