Tid access method feature from Hiroshi Inoue, Inoue@tpf.co.jp

src/backend/access/heap/heapam.c

src/backend/commands/explain.c

src/backend/executor/Makefile

src/backend/executor/execAmi.c

src/backend/executor/execProcnode.c

src/backend/executor/execTuples.c

src/backend/executor/nodeTidscan.c

src/backend/nodes/copyfuncs.c

src/backend/nodes/equalfuncs.c

src/backend/nodes/freefuncs.c

src/backend/nodes/outfuncs.c

src/backend/nodes/print.c

src/backend/nodes/readfuncs.c

src/backend/optimizer/path/Makefile

src/backend/optimizer/path/allpaths.c

src/backend/optimizer/path/costsize.c

src/backend/optimizer/path/tidpath.c

src/backend/optimizer/plan/createplan.c

src/backend/optimizer/plan/setrefs.c

src/backend/optimizer/plan/subselect.c