Improve argofloat plot

[gmaze]

• Introduce new colormap for profile QC flag
• Let ArgoFloat scatter map auto-select colorbar and legend setting depending on the parameter to plot

Example

from argopy import ArgoFloat
af = ArgoFloat(6902915)
af.plot.map('TEMP')  # Plot at pressure level closest to 0 by default
af.plot.map('PSAL', pres=450.) 
af.plot.map('PROFILE_TEMP_QC') # Appropriate colormap automatically selected
af.plot.map('DATA_MODE')  # Auto select cbar=False, legend=True
af.plot.scatter('PSAL_QC')  # Appropriate colormap automatically selected

PR to-do list:

• Add new features
• Check coverage and unit-test
• Update the documentation

[gmaze]

Note

It could be useful to gather plot settings for a specific Argo parameter out of the .plot caller (DataFetcher, ArgoFloat, ArgoIndex).
Whatever the caller, we should have only one code to trigger a plot.
This design would make it easy to add a new ds.argo.plot extension.

[quai20]

👍