plot multiple glaciers in same plot

[pat-schmitt]

In this PR I add the functionality to plot multiple glaciers in the same plot.

For this, a new grid is defined which contains all local gdir.grid completely. This new functionality can be used with the kwarg extend_plot_limit (e.g. plot_inversion(gdirs, extend_plot_limit=True)). If this is used there will be no topographic shading!

Closes #1007

(I have not added tests as it is only a plotting function)

• Fully documented
• Entry in whats-new.rst

[fmaussion]

👍

Possibly we could add a test for this in this test:

oggm/oggm/tests/test_workflow.py

Line 437 in c8bdf67

def test_plot_region_model():

Also: add an entry to whats new!

[pat-schmitt]

I added a test in test_plot_region_model(). How can the reference figure be changed?

[fmaussion]

How can the reference figure be changed?

Open a PR here: https://github.com/OGGM/oggm-sample-data/tree/master/baseline_images/freetype_28

Once merged, change the commit hash here:

oggm/oggm/utils/_downloads.py

Line 72 in c8bdf67

SAMPLE_DATA_COMMIT = 'dbd57434df8fade8d8df9206839b9bf26a1ef8e6'

[fmaussion]

It's actuall best to download the reference images from the test suite fails: they send a link