BUG: mandatory parameters in applicationengine

@CSSI_OTBrequested to merge
cs-si/otb:fix_parameter_is_optional into develop

Summary

fix logic of mandatory parameters of otb application instance.

Rationale

see #1662

Implementation Details

Application::IsMandatory is changed to Application::IsOptional

details of implementation is explained in the bug report.

Additional notes

Copyright

The copyright owner is CS Systemes d'Information (CS SI) and we had signed the ORFEO ToolBox Contributor License Agreement.

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
Edited by Rashad Kanavath

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