added skinpath field to set skin resolution path from properties

or from application code.

src/helma/framework/ResponseTrans.java

@@ -60,6 +60,9 @@ public class ResponseTrans implements Externalizable {
     // these are used to implement the _as_string variants for Hop templates.
     private transient Stack buffers;
 
+    // the path used to resolve skin names
+    public transient String skinpath = null;
+
     static final long serialVersionUID = -8627370766119740844L;
 
     /**