Public Git Hosting - PostgreSQL.git/commit

Migrate the former contrib/txid module into core. This will make it easier
for Slony and Skytools to depend on it. Per discussion.

12 files changed:

doc/src/sgml/datatype.sgml		diff \| blob \| blame \| history
doc/src/sgml/func.sgml		diff \| blob \| blame \| history
src/backend/utils/adt/Makefile		diff \| blob \| blame \| history
src/backend/utils/adt/txid.c	[new file with mode: 0644]	blob
src/include/catalog/catversion.h		diff \| blob \| blame \| history
src/include/catalog/pg_proc.h		diff \| blob \| blame \| history
src/include/catalog/pg_type.h		diff \| blob \| blame \| history
src/include/utils/builtins.h		diff \| blob \| blame \| history
src/test/regress/expected/txid.out	[new file with mode: 0644]	blob
src/test/regress/parallel_schedule		diff \| blob \| blame \| history
src/test/regress/serial_schedule		diff \| blob \| blame \| history
src/test/regress/sql/txid.sql	[new file with mode: 0644]	blob

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