Patch for S1 localization problems

Summary

Patch to solve partially our S1 localization problems (wrong GCPs).

Closes #1861 (closed)

Rationale

Used to correct S1 localization for S1 products taken after March 2017.

Implementation Details

Classes and files

Only one classe has changed : ossimSarSensorModel with comments for range time offet calculation. This calculation was made with GCPs as inputs and GCPs contain wrong lat/lon values for recent S1 products.

Additional notes

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

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Check before merging:

• All discussions are resolved
• At least 2 votes from core developers, no vote.
• The feature branch is (reasonably) up-to-date with the base branch
• Dashboard is green
• Copyright owner has signed the ORFEO ToolBox Contributor License Agreement