improve psql lo_* help

This makes help like this:

   \lo_export LOBOID FILE
   \lo_import FILE [COMMENT]
   \lo_list
   \lo_unlink LOBOID    large object operations

Instead of not saying anything about what arguments are required.

Chris

Index: src/bin/psql/help.c
===================================================================
RCS file: /projects/cvsroot/pgsql-server/src/bin/psql/help.c,v
retrieving revision 1.81
diff -c -r1.81 help.c
*** src/bin/psql/help.c    2 Oct 2003 06:39:31 -0000    1.81
--- src/bin/psql/help.c    17 Nov 2003 09:02:23 -0000
***************
*** 245,254 ****

      fprintf(output, _("Copy, Large Object\n"));
      fprintf(output, _("  \\copy ...      perform SQL COPY with data stream to the client host\n"));
!     fprintf(output, _("  \\lo_export\n"
!                       "  \\lo_import\n"
                        "  \\lo_list\n"
!                       "  \\lo_unlink     large object operations\n"));

      if (output != stdout)
      {
--- 245,254 ----

      fprintf(output, _("Copy, Large Object\n"));
      fprintf(output, _("  \\copy ...      perform SQL COPY with data stream to the client host\n"));
!     fprintf(output, _("  \\lo_export LOBOID FILE\n"
!                       "  \\lo_import FILE [COMMENT] \n"
                        "  \\lo_list\n"
!                       "  \\lo_unlink LOBOID    large object operations\n"));

      if (output != stdout)
      {