ENH: Let PointSet::Clone() do a "deep copy", instead of no copy at all

[N-Dekker]

Implemented InternalClone() for PointSet and PointSetBase, in order to let PointSet::Clone() and PointSetBase::Clone() do a deep copy of its points and point data.

---

• Following the suggestion from Bradley (@blowekamp) to override InternalClone(), at ENH: Add Clone() and MakeDeepCopy() to PointSetBase #4923 (comment)

• Intended to supersede pull request ENH: Add Clone() and MakeDeepCopy() to PointSetBase #4923

[dzenanz]

Are there any existing uses of PointSet::Clone()?

[N-Dekker]

Thanks for your approval @dzenanz 👍 And regarding your comment at #4923 (comment)

I remember that we exclude some non-code changes from triggering the CI.

Indeed, we excluded any '*.md' file and anything in the Documentation directory:

ITK/Testing/ContinuousIntegration/AzurePipelinesLinux.yml

Lines 9 to 26 in 5b121f4

	exclude:
	- '*.md'
	- LICENSE
	- NOTICE
	- Documentation/*
	- Utilities/Debugger/*
	- Utilities/ITKv5Preparation/*
	- Utilities/Maintenance/*
	pr:
	paths:
	exclude:
	- '*.md'
	- LICENSE
	- NOTICE
	- Documentation/*
	- Utilities/Debugger/*
	- Utilities/ITKv5Preparation/*
	- Utilities/Maintenance/*

In vain, apparently 🤷