Improved Documentation and added _eval_conjugate method to gammma
Added cross-references and references
Added _eval_conjugate to loggamma
eval_conjugate for lowergamma, uppergamma
Clean up documentation for Gamma functions
Fix evaluation of conjugates of incomplete gamma functions
Implement more special values for the polygamma function
Improve doc for gamma functions
Remove some functionality that breaks hyperexpand
Merge pull request #2800 from raoulb/newer_gamma

Newer gamma