pgsql: Add a --locale switch to createdb, to ease the creation of

Log Message:
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Add a --locale switch to createdb, to ease the creation of databases with
different locales.  This is just syntactical sweetener over --lc-collate and
--lc-ctype.  Per discussion.

While at it, properly document --lc-ctype and --lc-collate in SGML docs,
which apparently were forgotten (or purposefully ommited?) when they were
created.

Modified Files:
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    pgsql/doc/src/sgml/ref:
        createdb.sgml (r1.47 -> r1.48)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/createdb.sgml?r1=1.47&r2=1.48)
    pgsql/src/bin/scripts:
        createdb.c (r1.27 -> r1.28)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/createdb.c?r1=1.27&r2=1.28)