* User manual: Standardisation of the frame order indexing.
* User manual: Standardisation of the relaxation dispersion indexing.
* Travis CI config: Attempt at installing wxPython for Ubuntu and Python 2.7. This would allow for the whole test suite to be run on Travis CI on at least one OS. The instructions come from the stackoverflow response by dthor at [https://stackoverflow.com/questions/29290011/using-travis-ci-with-wxpython-testsstackoverflow response by dthor].
* FSF Copyright Validation script: The script now returns an exit status.
* Travis CI config: Avoid updating Conda. This seems to cause a breakage in installing matplotlib.