`PairwiseTest()` for comparing TAI between two conditions/contrasts, e.g. male vs female.

[LotharukpongJS]

New features

• PairwiseTest() computes the statistical significance when comparing TAI (or TDI) between two conditions/contrasts, e.g. male vs female, via permutation test (similar to ReductiveHourglassTest(), EarlyConservationTest(), LateConservationTest(), ReverseHourglassTest()). The alternative hypothesis between the two contrasts is specified using altHypothesis = "less" or altHypothesis = "greater". The distribution of the permutations w.r.t. the original value can be visualised by including plotHistogram = TRUE.
• pairScore() is a lower-level function for the PairwiseTest() that computes the difference in TAI (or TDI). The alternative hypothesis between the two contrasts is specified using altHypothesis = "less" or altHypothesis = "greater".

[HajkD]

Looks excellent. Thank you very much for adding these new features!