add cohort colours and fix MZL

[rdmorin]

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[rdmorin]

This is a very minor patch to add a few colours for the cohorts being used in a paper Kostia and I are working on.

[rdmorin]

A few additional minor patches in this one. Trying to improve portability for use of basic functionality outside the GSC

[mattssca]

Nice, just one comment on the newly added R script. Thanks!

[mattssca]

No newline at end of file.

[mattssca]

Thanks, ready to merge if you don't have any outstanding commits you would like to include.