Error Messages

- Improved error messages with specific field names rather than types.

src/columns/ColString.cpp

@@ -67,7 +67,7 @@ void ColumnString::measure (const std::string& value, int& minimum, int& maximum
     minimum = longestWord (value);
   }
   else
-    throw std::string ("Unrecognized column format '") + _type + "." + _style + "'";
+    throw std::string ("Unrecognized column format 'string.") + _style + "'";
 
 }