Make a source release on PyPi

The manylinux build did not by default also upload the sources to PyPi. This is added now.

Helper functions to avoid common bottlenecks

1.4.3

fix: don't use swig '-builtin' option because it changes the interface

1.4.1

• Upgrade to glpk 4.61
• Do not use brew glpk. Fixes bug causing instability with other packages also using glpk
• Add helpers to get all row/column primal/duals in one go from the C level as well as helper functions that convert Python lists to the required int/doubleArray types.

Python 3.6 support

Fix/py36 (#20)

* fix: add py36 to build plans

* fix: adjust to changes in setuptools

* fix: try again

* fix: stubborn setuptools..

* fix: different way to get versions

* try again

* ..and again

Python 3.6 support

Fix/py36 (#20)

* fix: add py36 to build plans

* fix: adjust to changes in setuptools

* fix: try again

* fix: stubborn setuptools..

* fix: different way to get versions

* try again

* ..and again