Would be nice to have visualize.sh scripts

[MakisH]

In cases where it is complicated to visualize results, we currently have some plot.sh or similar scripts that rely on Gnuplot, matplotlib, etc.

Since most visualization tools we use have some kind of CLI / API, it would be possible to provide visualize.sh scripts, at least per case.

My motivation is that I find that I click too much on ParaView every time I want to check something simple and this could save some of my attention/time.

[valentin-seitz]

I think this could also add a lot of value to the systemtests, especially when the fieldcompare fails.