wmshutdown.c: Correct package name for --version option.
wmshutdown.c: Restore original g_signal_connect() code for dialog buttons; new
gtk_dialog_run() code was buggy.

In particular, if a dbus error occurred, further clicks would do nothing.
wmshutdown.c: Consistent code style; no warnings or errors from checkpatch.pl
in Window Maker source tree.
Release version 1.3.