Prepare for release 1.6.0

Prepare for release 1.5.1

Prepare for release 1.5.0

Prepare for release 1.4.1

1.4.0 becomes unofficial due to a builder pipeline problem.

Prepare for release 1.4.0

Prepare for release v1.3.0

This is the same as v1.2.4, which was release erroneously as
a bugfix release, when it should have been a backwards-compatible
feature release.

Prepare for 1.2.4 release

Prepare for 1.2.4-alpha.1 release

Prepare for 1.2.0 Release

Updated version in setup.py an in docs conf.py

v1.1.4: Nick (patch 4)