Correct a bug in restart in FormulationQS.cc.
A line of code was missing for a restart after the emergence of a crack. Material variables are now updated after element duplication. Refactorise and comment a little more. git-svn-id: https://svn.ec-nantes.fr/eXlibris/Applis/TLSDuctile@2347 fbbead7c-fb4d-4173-aa67-51132c73c120
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