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Adds a filter to extract contour that works in parallel

guillaume Peillex requested to merge 30-needs-to-have-a-filter-to-extract-contour-of-mbds-even-in-case-of-client-server-use into main

This MR is a proposal to add a filter that can extract contour of datasets or of every dataset located in a vtkMultiBlockDataSet.

It also fixes the numeration/ordering of the point in the contour. The key was to use vtkStripper and vtkCleanPolyData filters.

Tests are added but cannot assess the success of // writing because the database (4 mats vortex computed on 8 procs - euler) has not a tree hierarchy that is the same on all processes. Thus we can test that in that case an error message is printed.

The testing of // writing requires a database that is represented the same way on all processes. As it is the case with the Hercule reader, // contour writing tests have been added in the GlobalIntegrationTests repository. A dedicated MR will be opened right after this one (globalintegrationtests!9 (merged)).

There are lot of differences because i renamed tests but i does not disturb the review process.

Closes #30 (closed)

Edited by guillaume Peillex

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