training: update
metomi/rose#269: date-time tutorial
metomi/rose#269: tidy
metomi/rose#269: minor adjustments
metomi/rose#269: tidy
metomi/rose#269: rephrase
metomi/rose#269: update DATAC example
Merge pull request #319 from benfitzpatrick/training.rose-date-tutorial

#269 - suite date/time manipulation tutorial