Enables quick calibration of radiocarbon dates under various
calibration curves (including user generated ones); age-depth modelling
as per the algorithm of Haslett and Parnell (2008) ; Relative sea level
rate estimation incorporating time uncertainty in polynomial regression
models (Parnell and Gehrels 2015) ; non-parametric phase modelling via
Gaussian mixtures as a means to determine the activity of a site
(and as an alternative to the Oxcal function SUM; currently
unpublished), and reverse calibration of dates from calibrated into
un-calibrated years (also unpublished).