grass-gxw.dtd: add cwd tag info

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@57930 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/xml/grass-gxw.dtd

@@ -21,10 +21,14 @@
 
 	element added 2008/04
 -->
-<!ELEMENT layer_manager ANY>
+<!ELEMENT layer_manager (cwd?)>
 <!-- window dimenstion (x, y (ur), width, heigth -->
 <!ATTLIST layer_manager  dim       CDATA   #IMPLIED>
 
+<!--    value of current working directory
+-->
+<!ELEMENT cwd         (#PCDATA)>
+
 <!--    a display element defines map layer connected to given
 	map display widnow