Description:
BREAK-POINTS FUNCTION: a 2D function defined as y=f(x) by a list of [x,y] coordinates.
BPF objects are constructed from the list of X coordinates (<x-points>) and the list of Y coordinates (<y-points>)
<x-point> must be stricly increasing or will be sorted at initialization.
If <x-list> and <y-list> are not of the same length, the last step in the shorter one is repeated.
<decimals> allows to specify the precision of the function (0 = integers, n > 0 = number of decimals)
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