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Optimised (minimised) use of decimal.Decimal in GPSTransform

Duncan Macleodrequested to merge
github/fork/duncanmmacleod/gps-plot-transform-opt into develop

This PR implements a slight optimisation of the use of decimal.Decimal in plotter.gps. The GPSTransformusesdecimal.Decimalviastr` to guarantee precision when converting to/from 19-sigfig GPS times, but we need to do this only when absolutely necessary, because it's very slow.

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