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Update F distribution with the beta function

Added second PDF form to the class javadoc.

Use the beta function following the Boost documentation for the F
distribution.

The CDF and SF can use the regularized beta or its complement. This is
chosen depending on the x argument.

The PDF can use the beta derivative using the same logic for choosing
the value passed to the derivative function.

Updated the log PDF to reduce the number of terms.

Added SF values to test files.

Large degrees of freedom data (n=100, m=100) requires a more accurate
source implementation.

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1585 of 1585 relevant lines covered (100.0%)

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