remove duplicate code in notebooks, analysis/

[raehik]

The Jupyter notebooks were updated to run correctly in previous commits, but they often used functions in the analysis/ folder which weren't used in the main library, and these weren't inspected. So we have two slightly different ways of e.g. obtaining CM2.6 ocean velocity data.

Also, a GlobalPlotter class defined in analysis/ is duplicated in some of the notebooks, with some changes (e.g. to keys used for the input dataset). At a glance these should be mergeable into a single instance.

• replace get_patch, get_whole_data with calls to lib.data functions
• have just one GlobalPlotter class

[review-notebook-app]

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