git-svn-id: https://geuz.org/svn/gmsh/trunk@16512 59c8cabf-10d6-4a28-b43f-3936b85956c4
structured field : add an option to set the value outside the grid

git-svn-id: https://geuz.org/svn/gmsh/trunk@16513 59c8cabf-10d6-4a28-b43f-3936b85956c4