REFACT: Deprecate `auto_ptr`

Summary

Replace use of std::auto_ptr<> with std::unique_ptr<>

Rationale

auto_ptr has been deprecated in C++11 and completely removed from C++17 standard.

This was the last occurrence of this class which emits a few warnings.

Implementation Details

The internal type used in ossimAdapter is updated to use unique_ptr<> instead of auto_ptr<>. Along the update, the test expressions are simplified.

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