Make gplugin_get_option_group() call gplugin_init() when parsing
This patch has the GOptionGroup returned from gplugin_get_option_group()
call gplugin_init() in its post parse hook. This is a convenience to
allow parsing arguments without explicitly calling gplugin_init()
beforehand.
/*
* Copyright (C) 2011-2013 Gary Kramlich <grim@reaperworld.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.