Make sure we never output numbers in scientific notation

Converting NSNumber to a string raises the possibility of outputing a
number like 2.2e-8, as it essentially uses the %g format specifier.
This then cannot be parsed.

Since there is no built-in specifier for outputing floats with variable
precision (ie: removing any trailing zeros), I cooked up a function to
do just that.

Currently set the maximum precision at 4dp (our normal grid layout only
makes use of 2dp).

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