reintroduce SpecialFuncs

[mzaffalon]

SpecialFuncs were removed in v1.0.0. Is there any plan to reintroduce them? What would it take? I would volunteer, if somebody can give guidance.

[jverzani]

Hmm, I can't recall why. I'd guess it is because we can access the sympy functions directly through x.func() style now. But if you wanted the julia counterparts, you could just define them directly, or use introspection the way importexport.jl is generated from import_sympy. It would be great it you did so,.

[mzaffalon]

I had a look at the file and it looks fairly straightforward. I will make the PR.
I suggest we keep SpecialFuncs in a submodule, unless there are objections.

[jverzani]

Okay, great. Thanks for tackling this. Just to be clear, the importexport.jl file is generated so don't make changes there. If you have to hand code things, just do so in the submodule. If they can be generated through introspection, then modify import_sympy.