#36 Custom Drawing from draw() return values -- PO

#35 Add BlindFunc to blind the true value of parameters -- CC

#33 Add draw_residual to (Un)binnedLH. BinnedLH draw show raw yield. Default

UnbinnedLH draw shows error bars. Add HistogramPdf analytical integral.

#30 AddPdf, Normalized, Extended, AddPdfNorm cascades analytical integral -- PO

#29 probfit integrate1d now use integrate method if available -- PO

#25 Use simpson3/8 rule instead of trapezoid for integral -- PO

#23 UnbinnedLH draw now show raw yield instead of density -- CC

#23 Add Errorbar option for drawing UnbinnedLH -- CC

#21 Add nint_subdiv to control how BinnedLH and

BinnedChi2 calculate integral -- PO

#19 Fix plotting normlization(to zero) -- PO

#16 Add a pdf class HistogramPdf -- CC

#14 Fix AddPdfNorm calculating wrong factor for the last part -- PO

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