Merge pull request #3 from lebarsfa/master

Bug fixes and additions.
Merge pull request #4 from lebarsfa/master

Bug fixes and harmonizations with interval_adapt.
Merge pull request #5 from lebarsfa/master

Modifications related to interval::Intersect(), interval::IsEmpty(), ope...
Merge pull request #6 from lebarsfa/master

Harmonizations with interval_adapt related to operators.
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