Columns

- Removed ColUDA::is_uda override, because it was wrong.  Now in the base class
  a member variable is referenced.

src/A3t.cpp

@@ -552,8 +552,13 @@ void A3t::findAttribute ()
             (*i)->attribute ("name", canonical);
             (*i)->attribute ("value", value);
 
-            if (context.columns[canonical]->modifiable ())
+            std::map <std::string, Column*>::const_iterator col;
+            col = context.columns.find (canonical);
+            if (col != context.columns.end () &&
+                col->second->modifiable ())
+            {
               (*i)->tag ("MODIFIABLE");
+            }
           }
 
           else if (canonicalize (canonical, "uda", name))