Starting thermal analysis script

Starting a thermal analysis script to evaluate the core and cladding
temperatures.
Added reference fuel pin change

Added the calculation for the temperature change over a reference fuel
pin.  It is about 1,800 K, which seems a little high (but agress witht
he 571 project)
Added the coatings into thermal analysis

Setting the thermal analsyis to use the coatings.  Next focus will be on
the inside cladding temperature.
Added in the change in fuel cladding

Added the change in the fuel cladding. I think the change is correct, it
is only about 200 degrees.
Added cladding temperature

Added the cladding temperature.