pgsql: Rename the new CREATE DATABASE options to set collation and ctype

Log Message:
-----------
Rename the new CREATE DATABASE options to set collation and ctype into
LC_COLLATE and LC_CTYPE, per discussion on pgsql-hackers.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        charset.sgml (r2.92 -> r2.93)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/charset.sgml?r1=2.92&r2=2.93)
        keywords.sgml (r2.23 -> r2.24)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/keywords.sgml?r1=2.23&r2=2.24)
    pgsql/doc/src/sgml/ref:
        create_database.sgml (r1.50 -> r1.51)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_database.sgml?r1=1.50&r2=1.51)
    pgsql/src/backend/commands:
        dbcommands.c (r1.219 -> r1.220)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/dbcommands.c?r1=1.219&r2=1.220)
    pgsql/src/backend/parser:
        gram.y (r2.661 -> r2.662)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y?r1=2.661&r2=2.662)
    pgsql/src/bin/pg_dump:
        pg_dump.c (r1.533 -> r1.534)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.c?r1=1.533&r2=1.534)
        pg_dumpall.c (r1.121 -> r1.122)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dumpall.c?r1=1.121&r2=1.122)
    pgsql/src/bin/scripts:
        createdb.c (r1.33 -> r1.34)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/createdb.c?r1=1.33&r2=1.34)
    pgsql/src/include/parser:
        kwlist.h (r1.1 -> r1.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/parser/kwlist.h?r1=1.1&r2=1.2)
    pgsql/src/interfaces/ecpg/preproc:
        ecpg.trailer (r1.6 -> r1.7)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/ecpg.trailer?r1=1.6&r2=1.7)