suppress rmcarddav's php version check

Since it says "RCMCardDAV requires at least PHP 5.6.18. Older versions might work", let's hope for the best.

Also hiding its preferences panel in settings since if it doesn't work, we don't want folks using it for anything but connecting to ownCloud contacts.

setup/webmail.sh

@@ -132,14 +132,12 @@ EOF
 cat > ${RCM_PLUGIN_DIR}/carddav/config.inc.php <<EOF;
 <?php
 /* Do not edit. Written by Mail-in-a-Box. Regenerated on updates. */
+\$prefs['_GLOBAL']['hide_preferences'] = true;
+\$prefs['_GLOBAL']['suppress_version_warning'] = true;
 \$prefs['ownCloud'] = array(
-	 // required attributes
 	 'name'         =>  'ownCloud',
-	 // will be substituted for the roundcube username
-	 'username'     =>  '%u',
-	 // will be substituted for the roundcube password
-	 'password'     =>  '%p',
-	 // %u will be substituted for the CardDAV username
+	 'username'     =>  '%u', // login username
+	 'password'     =>  '%p', // login password
 	 'url'          =>  'https://${PRIMARY_HOSTNAME}/cloud/remote.php/carddav/addressbooks/%u/contacts',
 	 'active'       =>  true,
 	 'readonly'     =>  false,