DrawForceChanged -> SetChanged


git-svn-id: https://geuz.org/svn/gmsh/trunk@16754 59c8cabf-10d6-4a28-b43f-3936b85956c4
improved MPEG animations:
- can loop over Print.Parameter and provide script using that parameter
- can preview animation


git-svn-id: https://geuz.org/svn/gmsh/trunk@16755 59c8cabf-10d6-4a28-b43f-3936b85956c4