Changeset 9714:68ea5c8f8d6c
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stats: Optimise the text-based stats output to improve speed

The text-based stats output is slow than the original C++ output. This patch
addresses some of those issues by removing:

    Asserts that are not required
    stats.ValueProxy, as it is no longer required
    Unnecessary calls to __getattr__ and __hasattr__

It also changes the formula calculation to only calculate the values and totals
of formulas if they have not been passed in from the C++. This allows other
formulas to be added, whilst ensuring that the stats output is sufficiently
fast.

Testing has shown a 6x - 8x increase in stats output speed.

Ensure that the output files are identical