Error fixes in depolarization.rst

Images required for depolarization.rst.

Error corrections of the depolarization.rst, up to the paragraph "Real Example".

Depolarization draft docs.

Adding depol in the docs.

Typos and small changes to HOI page.

Initial description about the handbook if instruments.

Merge from 62:f5bf7a56ffd6

Added tag v3.1 for changeset e3ff7af1d97e

Removed obsolete elda exit code FAQ v3.1

Link to the netcdf checker script.

More details on preprocessing exit code 21.

Documentation about the new list_display of products.

Corrected title length

No system deleted if channles or products are present.

(0) -15 +15 tip

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