This adds -I/--ignore to ignore certain datasets during xlim/ylim
calculations. The motivation for this is easier zooming into interesting
regions when one or two datasets have gone haywire.
I.e. anytime we include yaffs2 in throughput/ram plots.
There already exists a couple other options that do similar things, but
they're all a bit awkward for one reason or another:
1. -U/--undefine allows omitting specific datasets completely.
This is easy to use, but not quite what we want. We usually still
want to render the dataset in case it behaves reasonably for a some
portion of the plot, but -U/--undefine disables rendering entirely.
2. Explicit -X/--xlim and -Y/--ylim can be used to zoom wherever you
want.
This works, and is always available if you want more control over
zoom. But either requires significant extra scripting, or prior
knowledge of the dataset.
More often, we don't know exactly what the data will look like, but
we know one dataset will probably screw up the axes.
But now with -I/--ignore, it's easy to let plot.py/plotmpl.py know we
don't really care about the extremes of a dataset.
Christopher Haster
ed9d3e4e88