Discontinuing support for hosting wheels via Rackspace at wheels.scipy.org

[grlee77]

Please do not merge any new PRs in the pyFFTW-wheels repository until it can been updated to use an alternative solution for wheel storage. Apparently the agreement for free hosting there for https://wheels.scipy.org has now come to an end and alternatives are being explored.

See the following discussion thread on SciPy-Dev for updates:
https://mail.python.org/pipermail/scipy-dev/2020-February/023990.html

[grlee77]

I recently migrated wheel uploads to multibuild-wheel-staging for PyWavelets and scikit-image and the same approach should work here. For reference, see MacPython/pywavelets-wheels#13.

Also, if we want to provide AArch64 wheels in the future, this is also now possible via Travis-CI, following the approach in MacPython/pywavelets-wheels#12.