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Updated Python versions

MRG Ivan's changes from #212, rebased

A rebased and slightly edited version of #212 - with thanks.

Bump default hdf5 version to 1.10.5 in library_builders.sh

Uppercase variable looked more official, and so - to me - was confusing.

add aarch64, s390x, ppc64le manylinux2014 support

MRG: update README, mainly for macOS

Mainly consolidating changes from #280 and #281

Co-Authored-By: Andrew Murray <3112309+radarhere@users.noreply.github.com>

MRG: Add 3.8 tests for linux + mac, make 3.8 the default for mac

Addresses #261 

MRG: Drop old PyPy versions from CI testing on osx

Together with adding a new PyPy version in #266, no need to test PyPy versions that cannot support NumPy even on Python2.7. FWIW, [PyPy 5.4 was released](https://morepypy.blogspot.com/2016/08/pypy2-v54-released-incremental.html) in Aug 2016, [5.3 was released](https://morepypy.blogspot.com/2016/06/pypy2-v53-released-major-c-extension.html) in June 2016 which is 42 months ago, the cutoff as per [NEP 29](https://numpy.org/neps/nep-0029-deprecation_policy.html#detailed-description) for CPython 

MRG: Changed bzip2 download URL

https://download.sourceforge.net/bzip2/ only has 1.0.6, while https://sourceware.org/pub/bzip2/, as found at https://sourceware.org/bzip2/, has 1.0.1 through 1.0.8.

MRG: Allow user to override PLAT for macOS builds

Add ability for user to override `PLAT` for macOS builds. Prior to this `PLAT` was only used for linux builds. 

closes #252 

Fixed typo

MRG: set MB_PYTHON_OSX_VER default to the newest available

Use 10.9 installers where they are available, instead of defaulting to 10.6 installers.

Discussion in #273