Additional line with plot global data over time, in parallel.

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

This bug only shows in parallel, numerous mpi ranks, with number of ranks less than or equal to number of files. Basically, the end point is connected back to the first point in the plot global data over time.

Linux, 8 pvservers, 5.0.1.
Load z_pinch1.8.[0-7]. Load all variables. Apply.
Plot global data over time. Apply.
Turn off all variables. Turn on variable ZMON.

<> Notice the straight line going back to the start. This is a bug.

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