Automate the Julia installation

[ChrisRackauckas]

@johnnychen94 is this the right way to check for an existing installation?

@tkf can you help make sure this works correctly with diffeqpy?

[johnnychen94]

Looks good to me. I guess you'll also need to add jill as the dependency in

diffeqpy/setup.py

Line 27 in 28cf124

install_requires=['julia>=0.2'],

[johnnychen94]

I'm not a Python expert so I don't know where the reference is but it seems that the codes(installation) run only when you do import diffeqpy.de and not on import diffeqpy. To make it work, we have to do it in diffeqpy/__init__.py.

Given that jill.py doesn't support quite installation now, probably a better place is to put it in install() and let users trigger it manually?

[ChrisRackauckas]

@tkf set that part up so I'll have to ask for his guidance there.

[ChrisRackauckas]

This automation is now done by JuliaCall