Add link to VII documentation.

[sjoro]

viiinterpolator is a prototype based on documentation that is not at this time publicly available. Link to the documentation should be added once documentation is published.

[djhoese]

Is this available now?

[sjoro]

@pepephillips you worked on VII at the time, can you confirm?

[pepephillips]

Hi Sauli, The tiepoint extraction for METimage is described in the METimage L1B PFS but I don't know if this is public yet. The viiinterpolater in geotiepoints was not written by me (might have been Respase?). I did write a parallel version that followed the PFS equations exactly and compared the result to the version in geotiepoints. The result was the same, my version was just 10 times slower.... Does this help? Else, I am not sure what is required in terms of documentation. Best, Pepe

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