git-svn-id: https://geuz.org/svn/gmsh/trunk@20216 59c8cabf-10d6-4a28-b43f-3936b85956c4
management of archived solution files and recomputations

git-svn-id: https://geuz.org/svn/gmsh/trunk@20217 59c8cabf-10d6-4a28-b43f-3936b85956c4