No data documentation in Segmentation

Summary

This merge request improves the documentation and the logs of the Segmentation application:

• The fact that the application does not handle no data is documented in the Limitation section.
• No data values of the input image is extracted from the meta data. If a no-data value is found, a warning is thrown.
• The link to the meanshift application in the SeeAlso section was broken.
• The endl have been removed from the logs as AppLogXXX already prints an endline character.

See related issue #1860.

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