Material: fixes, FEM: very small code formating
Created by: berndhahnebach
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Branch rebased on latest master git pull --rebase upstream master
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Unit tests confirmed to pass by running ./bin/FreeCAD --run-test 0
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Commit message is well-written
fixes duplicate unit definition in materials See https://forum.freecadweb.org/viewtopic.php?f=38&t=33929