Computes permutation test for Blomberg's K

Test Pagel's Lambda Optimize Pagel's Lambda and do a likelihood ratio test.

1 | ```
lambdaTest(x, vcv)
``` |

`x` |
a vector of numeric data. |

`vcv` |
the phylogenetic variance-covariance matrix. |

The optimization process is currently performed in R. Could be interesting to do this in Cpp and merge with codepagelLogLik.

Questions? Problems? Suggestions? Tweet to @rdrrHQ or email at ian@mutexlabs.com.

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