Replace Makefile with tox (#2331)

Porting notes:

- tox handles Python environments automatically. Remove a bit of PYTHONPATH
  manipulation (that was using Python 2 code which always failed!)

- No `clean` target: `git clean -xdf` should fit the bill.

- No `reindent` target: the `reindent.py` script it was using does not
  exist (anymore?).

- No equivalent of tox-test-coverage, which was an artifact of the past,
  using nose.  Instead, the test-coverage target only is ported, which
  uses pytest, and works.

1 files changed, 4 insertions, 0 deletions

diff --git a/CHANGES b/CHANGES
index b76c9e2c..f4ace2fe 100644
--- a/CHANGES
+++ b/CHANGES
@@ -35,6 +35,10 @@ Version 2.15.0
 - Move project metadata to ``pyproject.toml``, remove ``setup.py``
   and ``setup.cfg`` (#2342)
 
+- The top-level ``Makefile`` has been removed. Instead, all shortcuts
+  for developing are now defined and run through tox.  The ``doc`` folder
+  still contains a ``Makefile`` as an alternative to ``tox -e doc``.
+
 Version 2.14.0
 --------------
 (released January 1st, 2023)