* add darshan 3.4.3 releases
* darshan-runtime 3.4.3
* darshan-util 3.4.3
* py-darshan 3.4.3.0
- add py-humanize as new dependency
* py-darshan has strict darshan-util version reqs
darshan-util version required is based on the first 3 parts of
the py-darshan version string
* remove support for python3.6
* py-humanize dependency for 3.4.3+ versions
* only enforce scipy dependency for 3.4.0.1
* drop optional lxml dependency
* drop matplotlib pinning
* importlib-resources not a dep in python-3.7+
* drop unnecessary numpy pin
* add build dep for pytest-runner
* fix typo in pytest-runner package name
* pip setuptools to match pydarsan setup.py
* spack style fix
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