Add vtm debug files

experimental/data/debug/cercle2d_r3.vtp

+<?xml version="1.0"?>
+<VTKFile type="PolyData" version="0.1" byte_order="LittleEndian"> 
+<PolyData>
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+<Points>
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+</Points> 
+<PointData Scalars="intputValue0 "  > 
+<DataArray type="Float64" Name="inputValue0"  format="ascii">
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+    </PointData>
+    <CellData> </CellData>
+    <Verts>
+    <DataArray type="Int32" Name="connectivity" format="ascii">
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+</DataArray>
+<DataArray type="Int32" Name="offsets" format="ascii">
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
+</DataArray>
+    </Verts>
+<Lines></Lines>
+<Strips></Strips>
+<Polys></Polys>
+</Piece>
+</PolyData>
+</VTKFile>

experimental/data/debug/prolate.vtp

+<?xml version="1.0"?>
+<VTKFile type="PolyData" version="0.1" byte_order="LittleEndian"> 
+<PolyData>
+<Piece NumberOfPoints=" 30 "  NumberOfVerts=" 30 " NumberOfLines=" 0" NumberOfStrips="0" NumberOfPolys="0">
+<Points>
+<DataArray type="Float64" NumberOfComponents="3" format="ascii"> 
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+</DataArray> 
+</Points> 
+<PointData Scalars="intputValue0 "  > 
+<DataArray type="Float64" Name="inputValue0"  format="ascii">
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+</DataArray>
+    </PointData>
+    <CellData> </CellData>
+    <Verts>
+    <DataArray type="Int32" Name="connectivity" format="ascii">
+0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 
+</DataArray>
+<DataArray type="Int32" Name="offsets" format="ascii">
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
+</DataArray>
+    </Verts>
+<Lines></Lines>
+<Strips></Strips>
+<Polys></Polys>
+</Piece>
+</PolyData>
+</VTKFile>