wtf?


git-svn-id: https://geuz.org/svn/gmsh/trunk@18497 59c8cabf-10d6-4a28-b43f-3936b85956c4
pp


git-svn-id: https://geuz.org/svn/gmsh/trunk@18498 59c8cabf-10d6-4a28-b43f-3936b85956c4
new attribute "Persistent" to keep some attributes alive after a reset


git-svn-id: https://geuz.org/svn/gmsh/trunk@18499 59c8cabf-10d6-4a28-b43f-3936b85956c4