Show conflict warning when user_ldap and user_webdavauth are enabled

apps/user_ldap/appinfo/app.php

@@ -42,3 +42,6 @@ $entry = array(
 );
 
 OCP\Backgroundjob::addRegularTask('OCA\user_ldap\lib\Jobs', 'updateGroups');
+if(OCP\App::isEnabled('user_webdavauth')) {
+	OCP\Util::writeLog('user_ldap', 'user_ldap and user_webdavauth are incompatible. You may experience unexpected behaviour', OCP\Util::WARN);
+}

apps/user_ldap/appinfo/info.xml

@@ -2,7 +2,9 @@
 <info>
 	<id>user_ldap</id>
 	<name>LDAP user and group backend</name>
-	<description>Authenticate Users by LDAP</description>
+	<description>Authenticate users and groups by LDAP resp. Active Directoy.
+
+	This app is not compatible to the WebDAV user backend.</description>
 	<licence>AGPL</licence>
 	<author>Dominik Schmidt and Arthur Schiwon</author>
 	<require>4.9</require>

apps/user_ldap/css/settings.css

@@ -7,4 +7,9 @@
 #ldap fieldset input {
 	width: 70%;
 	display: inline-block;
+}
+
+.ldapwarning {
+	margin-left: 1.4em;
+	color: #FF3B3B;
 }