Mesh remove isolated vertex

[kerautret]

PR Description

By default the Meshreader imports all vertex even if they are not associated to a face. This PR adds a method to remove them that allows to avoid errors when applying conversion to a SurfaceMesh for instance. It also include a read improvement to ignore path when the material path is wrong and load by default from the current path.

Checklist

• Unit-test of your feature with Catch.
• Doxygen documentation of the code completed (classes, methods, types, members...)
• Documentation module page added or updated.
• New entry in the ChangeLog.md added.
• No warning raised in Debug mode.
• All continuous integration tests pass (Github Actions)

[dcoeurjo]

Thanks for the PR. Just minor comment

[kerautret]

thanks @dcoeurjo just done, but perhaps DGtalTools will failed from the renaming I will do it afterwards

[kerautret]

Done small PR in DGtalTools : DGtal-team/DGtalTools#453 that need to be merged before