pgsql: Add init[db] option to pg_ctl pg_ctl gets a new mode that runs

Log Message:
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Add init[db] option to pg_ctl

pg_ctl gets a new mode that runs initdb. Adjust the documentation a bit to
not assume that initdb is the only way to run database cluster initialization.
But don't replace initdb as the canonical way.

Author: Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM>

Modified Files:
--------------
pgsql/doc/src/sgml:
config.sgml (r1.235 -> r1.236)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml?r1=1.235&r2=1.236)
manage-ag.sgml (r2.58 -> r2.59)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/manage-ag.sgml?r1=2.58&r2=2.59)
runtime.sgml (r1.428 -> r1.429)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/runtime.sgml?r1=1.428&r2=1.429)
xfunc.sgml (r1.142 -> r1.143)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xfunc.sgml?r1=1.142&r2=1.143)
pgsql/doc/src/sgml/ref:
initdb.sgml (r1.44 -> r1.45)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/initdb.sgml?r1=1.44&r2=1.45)
pg_ctl-ref.sgml (r1.46 -> r1.47)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_ctl-ref.sgml?r1=1.46&r2=1.47)
pgsql/src/bin/pg_ctl:
pg_ctl.c (r1.115 -> r1.116)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_ctl/pg_ctl.c?r1=1.115&r2=1.116)