Just print waring message if error on derived variable check - might …

…be the variables are in the wrong order

jLems doesn't mind this, so letting it pass...

src/main/java/org/lemsml/jlems/core/type/dynamics/Dynamics.java

@@ -559,8 +559,8 @@ public void checkEquations(HashMap<String, Dimensional> cdimHM) throws ContentEr
 			try {
 				dimHM.put(dv.getName(), dv.getDimensionality(dimHM));
 			} catch (ContentError ce) {
-				String errmsg = ("Checking " + dv + " in " + r_type + " " + ce.getMessage());
-                throw new ContentError(errmsg);
+				String errmsg = ("Checking derived variable: " + dv + " in " + r_type + "\nError here: " + ce.getMessage());
+                E.error(errmsg+"\n**************\n* Note: this may not be a serious error, in the case that the derived variables are all present, just have been specified out of order, e.g. b = f(a) is defined in the xML file before a is defined. ");
 
 			}
 		}