Code Cleanup - obsolete code

- Removed obsolete T::removeAttributes.
- Removed obsolete T::sequenceContains.
- Modified handleInfo so it no longer uses T::sequenceContains, and
  instead uses filterSequence.

src/objects/T.h

@@ -41,6 +41,8 @@ public:
   std::string composeF4 ();
   std::string composeCSV ();
 
+  // TODO Series of helper functions.
+
 private:
 };