Changeset 9513:6e1f6c9cd4ac
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stats: Add a separate display class for vector formulas

This patch adds a separate display class for vector formulas, which is
tailored to more closely resemble that of the original C++ based
stats. Unlike the vector class, the total for a formula needs to be
evaluated by calculating the total of the numerator and the total of
the denominator, and then dividing them. Therefore, the vector formula
display class calls the total function of the formula, rather than
evaluating the total locally.