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This is a minor feature and bugfix release. It includes tooltip improvements in the GUI for the user function windows and wizards, the addition of the newly published [https://doi.org/10.1017/S0033583519000015 primary reference for the frame order analysis], and improved formatting for the bibliography and index of the relax manual.
There have also been improvements for the [https://travis-ci.com/nmr-relax/relax automated testing of relax by Travis CI]. This includes the naming of the build jobs, the execution of the software verification tests, the installation of wxPython to enable GUI testing and the running of the whole test suite, the reordering of the system tests back before the unit tests to avoid hiding some nasty relaxation dispersion bugs, a fix for matplotlib on Mac OS X so that the tests will finally run on this OS, a new build job for the API documentation, and a new build job for the Free Software Foundation copyright validation script.
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