Updated ProbabilityUpdates

ProbabilityUpdates2.py now checks to see if POAsum has a value before
proceeding.  If it does not than it most likely has not been assigned
yet.  If not assign, the script checks to see if values exist in
POCaSsign than calculate POAcum.  If they do exist than this initial
calculation is bypassed and the conventional update proceeds.
Probability Updates #2

When the Probability Updates is run the script now confirms if the
Probabilities had been previously entered.  If not it calculates the POA
based on the assigned values and normalizes.  If the POA has already
been assigned and normalized, the script re-calculates the value and
compares to the existing value in case a change was made to the assigned
POA.  Then the script looks for any updates through Assignment_Debrief.