v2.1.0

• Add method RenumberTips.Splits().
• FirstMatchingSplit(x) provides performant alternative to match(x)[[1]].
• Support logical pole in PolarizeSplits().
• RenumberTree() supports numeric tipOrder input.
• Support larger trees in ClusterTable objects.
  • Retires CT_PUSH and CT_POP macros.
• Support larger trees in Consensus().
  • Uses 32-bit integers, necessitating downstream changes to TreeDist.
• Remove hard limit on tree size in SplitList.
• MatrixToPhyDat() gains tipLabels parameter.
• Document return value for J1Index().