added isAuto method so I can find out if it is

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@193589 13f79535-47bb-0310-9956-ffa450edef68

src/org/apache/fop/datatypes/Length.java

@@ -136,6 +136,11 @@ public class Length {
 	return millipoints;
     }
 
+    public boolean isAuto()
+    {
+	return auto;
+    }
+
     public String toString() {
 	String s = millipoints + "mpt";
 	return s;