Changelog for math-functions-0.2.1.0

Changes in 0.2.1.0

log1p and expm1 are simply reexported from GHC.Float. They're methods of Floating type class.
On windows expm1 is implemented in pure haskell for older GHCs.

logGamma now uses Lancsoz approximation and same as logGammaL. Old implementation of logGamma moved to Numeric.SpecFunctions.Extra.logGammaAS245.
Precision of logGamma for z<1 improved.
New much more precise implementation for incompleteGamma
Dependency on erf pacakge dropped. erf and erfc just do direct calls to C.
Numeric.SpecFunctions.expm1 added
Numeric.SpecFunctions.log1pmx added.
logGammaCorrection exported in Numeric.SpecFunctions.Extra.
Module Numeric.Series added for working with infinite sequences, series summation and evaluation of continued fractions.
Module statistics: Statistics.Math.RootFinding copied to Numeric.RootFinding. Instances for binary and aeson dropped.
Root-finding using Newton-Raphson added
Numeric.MathFunctions.Comparison.ulpDelta added. It calculates signed distance between two doubles.
Other bug fixes.

Module statistics: Statistics.Function.Comparison moved to Numeric.MathFunctions.Comparison. Old implementation if within compared negative numbers incorrectly.
addUlps and ulpDistance added to Numeric.MathFunctions.Comparison.
relativeError and eqRelErr added to Numeric.MathFunctions.Comparison.
Precision of logFactorial is slightly improved.

logFactorial type is genberalized. It accepts any Integral type
Evaluation of polynomials using Horner's method where coefficients are store in lists added