(FEFLOW model or FEFLOW file path)

OGS from different resources

See merge request ogs/tools/ogstools!249

[meshlib] add append method to mesh series

See merge request !245

post-processing features / cleanup

See merge request !259

otherwise fails on windows pip CI test

moved from MeshSeries to plot

to demonstrate a clean way to compare numerical
results with reference results

Should now correcftly only label outer axes of
shared axes.

this is a behavior we have as a de facto standard in plot functions, but contourf was not yet adhering to this.

refactored out function to normalize 2 var args