Computes log-likelihood for data and a given value of Pagel's Lambda

1 | ```
pagelLogLik(lambda, xr, vcvr)
``` |

`lambda` |
the value of Pagel's Lambda |

`xr` |
a vector of data |

`vcvr` |
phylogenetic variance-covariance matrix |

Adapted from Liam Revell's R function 'phylosig' phytools.

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