base_object torque application is inaccurate

[Rick Stovall]

in cpp/sim_engine/base_object/base_object.cpp:

bool base_object::apply(int time, float quanta)
{
  (....)
  triplet ra = torque / (tmass * 0.5); // not accurate!!
  (....)
};

This does not accurately reflect how mass interacts with torque to produce changes in rotational velocity.