Switch to numpy.distutils

[astrojuanlu]

The included makefile only works on Linux, so this change should allow the library to be compiled on Windows and OS X too.

[astrojuanlu]

The option of distributing all of CEPHES along with pycephes has the potential drawback of coupling the platform dependent and the platform independent parts.

• pycephes may evolve, but is nonetheless cross platform.
• cephes won't ever evolve, but is not cross platform.

So I can provide cross platform packages of CEPHES once, and then focus on developing pycephes around it.

[astrojuanlu]

Building with distutils does not render CEPHES a Python package though. I will have to play with the corresponding recipes.

[astrojuanlu]

Work started at:

https://github.com/Juanlu001/cephes

Inspiration:

https://github.com/conda/conda-recipes/tree/master/glpk

[astrojuanlu]

The CEPHES code shipped by SciPy adds some additional logic, see:

https://github.com/scipy/scipy/blame/maintenance/0.17.x/scipy/special/cephes/mtherr.c
https://github.com/scipy/scipy/blame/2224a4b9f2d2ad4605d5098c10da9351c002c266/scipy/special/cephes/mtherr.c

We have to decide which version to use.

[astrojuanlu]

On the other hand the version packaged in http://www.moshier.net/double.zip requires careful selection of the sources to compile.

[astrojuanlu]

By the way, we'd better leave the conda recipe outside of this repository and put it directly on conda-forge (see #2).

[astrojuanlu]

A version which installs correctly is already available at https://github.com/poliastro/cephes/. I will close the issue as soon as everything is tested.