Merge branch 'fix/ExtractSurface3DH1D' into 'master'
Fix/extractsurface3DH1D This MR extends the extract surface module of FieldConvert to work with 3DH1D expansions. The addnormals option is also extended to 2D and 3DH1D expansions. I had to force FieldConvert to declare all expansions using NewField=true, since otherwise it would not work. This seems to be a problem with the copy constructor from ContField3DH1D (maybe with the boundary expansions?). See merge request !521
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