Writer2xhtml custom config ui + EPUB export

git-svn-id: svn://svn.code.sf.net/p/writer2latex/code/trunk@55 f0f2a975-2e09-46c8-9428-3b39399b9f3c

source/java/writer2latex/xhtml/XhtmlDocument.java

@@ -173,6 +173,10 @@ public class XhtmlDocument extends DOMDocument {
     	return "";
     }
     
+    @Override public boolean isMasterDocument() {
+    	return true;
+    }
+    
     public Element getHeadNode() { return headNode; }
 	
     public Element getBodyNode() { return bodyNode; }