improve certificate handling in SUSE Linux

Adding setuptools.command.py36compat module with functionality copied from distutils.command.sdist in 6d5603e41569

fix for extra names containing '-'

Follow PEP8 for keyword arguments syntax in setup

 Upgrade pyparsing to version 2.1.10

Find nested packages with excluded parent

`find_packages(exclude=['pkg'])` should still find and include the
`pkg.subpkg` package.

Fixes #808

Fix misspellings in changelog.