Log Message:
-----------
Document the "register" and "unregister" pg_ctl subcommands, for use on
Windows. Patch from Magnus Hagander.
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
pg_ctl-ref.sgml (r1.30 -> r1.31)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_ctl-ref.sgml.diff?r1=1.30&r2=1.31)