Updates to ogsdatacompare

Purpose

Update to ogsdatacompare

Features

• more automatic generation of the overview plot (ogs_compare())
• readability tweaks to other plots
• ogs_compare can use external analytical solution object to draw reference function
• separate function for saving legend as a separate figure
• ogs_compare can save its legend as a separate figure
• fix the issue with the missing empty line at the end of the file
• added ability to compare results with inconsistent time steps

Application background

Is the code linked to a specific application? If so, to which?

Categories

• preprocessing
• postprocessing
• visualization
• HPC
• application specific scripts

Example

If sensible, please add a screenshot something similar to illustrate the merge request.