Interfacing with Rubi

[tpfto]

One reason for writing a package for the Carlson functions was to facilitate the derivation of elliptic integral expressions. To that regard, I plan to combine the information in Carlson's series of papers to reduce any elliptic integral to his set of standard functions with the implementation in Rubi, so that one can get elliptic integral expressions that are not needlessly complicated. (By contrast, current symbolic results for elliptic integrals in Mathematica often have unneeded complex factors, even when the results should be real.)

This part of the project is quite nontrivial, and might take a while longer to implement properly.