Removing (inaccurate) virial temperature calc.

Removing (inaccurate) virial temperature calc.

Removing the virial temperature, which is not a reliable measure.
Earlier, I had put in a calculation of temperature via the virial
to try to validate the potential energy distribution. It turns out
this is not a good way of doing things, as the virial temperature
differs from the true temperature by a factor proportional to the
pressure, which is not very useful for sentitive calculations.  It's
better to use the ensemble validation relationships I developed.
So in the spirit of simplifying the code (which we all agree needs
to be done), I'm removing this calculation.

Change-Id: Ic942b9af294d928d1675de4f45436dc43aff9649