manylinux tags should come after linux tags

[dholth]

I designed packaging tags to come in order of "most specific to this machine" to "least specific to this machine". Unfortunately pip has interpreted this as meaning "most specified", putting "manylinux1" before "linux_x86_64", even though any "linux_x86_64" wheels visible to pip should have been compiled on exactly the machine you're in.

When a particular manylinux wheel is broken, you should be able to compile a linux_x86_64 wheel, add it to pip's search path, and pip would prefer the wheel you compiled. With manylinux1 first the option of having a folder of known-good-and-preferred wheels is not available, instead you have to use no-binary or avoid specific packages.

It would also be helpful if a packaging tool could just pick the first tag from the list, instead of skipping all the manylinux tags, when choosing a tag for a new binary wheel.