Let events support temporal color changes #5695
Merged
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Description of proposed changes
This PR adds one more time-function (via -Mz) that adds the relevant fraction of the amplitude [1] to the data set's z-values (mostly expected to be zero). Thus, as z now becomes modulated around the event time the colors obtained by CPT lookup also changes. I have updated the documentation and added the fourth time-function description, as well as a movie still example (trajectory5.sh) which when run as GIF demonstrates the effect (note the change of line color at the burning end).
Closes #5684.