pgsql: One-letter backslash commands now need a space before the first

[petere(at)postgresql(dot)org (Peter Eisentraut)]

Log Message:
-----------
One-letter backslash commands now need a space before the first argument.
This has been the only documented and encouraged syntax for a long time, and
with extension facilities such as aliases being proposed, it is a good time to
clean up the legacy syntax a bit.

Author: Bernd Helmle <mailings(at)oopsware(dot)de>

Modified Files:
--------------
    pgsql/src/bin/psql:
        command.c (r1.186 -> r1.187)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/command.c?r1=1.186&r2=1.187)
        psqlscan.h (r1.8 -> r1.9)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/psqlscan.h?r1=1.8&r2=1.9)
        psqlscan.l (r1.23 -> r1.24)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/psqlscan.l?r1=1.23&r2=1.24)