FIX: compilation error. (#710)

For some reason we are returning a method's name instead of
calling it.

Fixes  #705

src/gsModeling/gsTemplate.h

@@ -585,7 +585,7 @@ class gsTemplate  : public gsBoxTopology
         return os; 
     }
 
-    short_t parDim() const { return dim; }
+    short_t parDim() const { return dim(); }
 
     /// Number of patches    
     index_t nPatches() const { return this->size(); }