Fixed encoding problems in WebDAV and vfs:

- egw_vfs::download_url as not encoding + or ' ' in pathes
- HTTP_WebDAV_Server was urldecoding $_SERVER[PATH_INFO], which is
  wrong, as it is NOT encoded
- HTTP_WebDAV_Server was NOT urlencoding the pathes in PROPFIND
  responses, causing eg. cadaver not to be able to use dirs containing
  + or space

etemplate/inc/class.vfs_widget.inc.php

@@ -137,7 +137,7 @@ class vfs_widget
 					{
 						if ($n < count($comps)-1 || $mime == egw_vfs::DIR_MIME_TYPE)
 						{
-							$value['l'.$n] = '/index.php?menuaction=filemanager.filemanager_ui.index&path='.$path;
+							$value['l'.$n] = '/index.php?menuaction=filemanager.filemanager_ui.index&path='.urlencode($path);
 							$target = '';
 						}
 						else

phpgwapi/inc/class.egw_vfs.inc.php

@@ -992,7 +992,7 @@ class egw_vfs extends vfs_stream_wrapper
 		{
 			$path = parse_url($path,PHP_URL_PATH);
 		}
-		return '/webdav.php'.$path;
+		return '/webdav.php'.strtr($path,array('%' => '%25','+' => '%2B',' ' => '%20'));
 	}
 
 	/**