Change the order of the plotted lines

Adjust number of columns in the legend

Summarize the data to plot (e.g., show total throughput)

Meaning each (sub-)plot starts at zero

plots multiple files into one image, arguments can be given per subplot

basic functionality already there,
but can only plot from a single file, yet

Axis labels adapt to zoom

Time axis and throughput axis are now adapted to zooming. New command line argument "-nsc" to specify maximum of throughput axis.

See merge request !1

Patch provided by: Michael Herzog <michael.herzog2@student.kit.edu>

- Large font for good readability on presentation slides.
- Human readable axis labels

Maybe it only works for presentations, now.
And probably has to be adjusted in the future for papers.

e.g. --large-font

but some todos left and testing needed..

since it's not so simple anymore..