pybill #18503 Rounding errors in the documents [resolved]

Quite often, the PDF only displays 2 digits for the decimal parts of the number and the PDF bills seem to be wrong as the total are not equal to the sum of the items written on the document.

We should choose an accuracy for our computations and round every number with this accuracy before writing them on the PDF or using them to compute other numbers.

done in1.0.0
load left0.000
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