TLVMsg and TLVList improvments


  * Change Vector to ArrayList (some performance boost)
    In most cases TLV operations are single threaded.
    So using Vector as contener with synchronisation
    is not required
  * Use foreach syntax if posible
  * Add modern List<TLVMsg> getTags() method
  * Override TLVMsg.toString() method
  * Enable packing TLVMsg with zero length (empty) value
and
  * Refactoring TLVListTest
  * TLVList, TLVMsg javadoc fixes