Ethan Merritt - 2016-12-29

I guess it is a side-effect of this bugfix, but I have not gone back to test that guess.

2016-10-26 Thomas Sefzick
* src/plot2d.c: Never decrease value of highest_iteration.
Avoids missed plots when a plot command contains more than one
iteration and the last iteration is shorter than the others.
Bug #1871