[fix] Backport fixes from my old dev branch.

scripts/remove

@@ -1,27 +1,40 @@
 #!/bin/bash
 
-# VPN Client app for YunoHost 
+# VPN Client app for YunoHost
 # Copyright (C) 2015 Julien Vaubourg <julien@vaubourg.com>
 # Contribute at https://github.com/labriqueinternet/vpnclient_ynh
-# 
+#
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero 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 Affero General Public License for more details.
-# 
+#
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-source ./helpers
+#=================================================
+# GENERIC STARTING
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
 
-# Retrieve arguments
-domain=$(sudo yunohost app setting vpnclient domain)
+source _common.sh
+source /usr/share/yunohost/helpers
 
+#=================================================
+# LOAD SETTINGS
+#=================================================
+
+app=$YNH_APP_INSTANCE_NAME
+
+domain=$(ynh_app_setting_get $app domain)
+
+#=================================================
 # The End
 ynh_systemctl stop ynh-vpnclient-checker.service
 sudo systemctl disable ynh-vpnclient-checker.service