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Added triangular distribution - #2
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Added a triangular
reno.components.Distributiontoreno/ops.py.After NIST Guide to the Expression of Uncertainty in Measurement (https://www.nist.gov/itl/sed/topic-areas/measurement-uncertainty), Section 4.3.9 discusses step function discontinuities (such as when using Uniform distributions) as unphysical, instead recommending trapezoidal distributions. For$\beta=0$ (flat top of trapezoidal distribution), this collapses to a triangular distribution. Further, Section F.2.3.3 further discusses use of triangular distributions when uncertainties are given as maximum bounds but when "there is reason to expect that values within but close to the bounds are less likely than those nearer the centre of the bounds."