Handle task output that's also part of a repeated task.

[luciansmith]

In the attached SED-ML/SBML file, there's a repeated task, and also a plot from the base task. Tellurium uses the final task run from the repeated task as output; it shouldn't use the repeated task data at all; it should be a separate simulation.

Garde2020.xml.txt
Garde2020-Fig4.sedml.txt