Added GFaceCompound and other details to gmshpy

git-svn-id: https://geuz.org/svn/gmsh/trunk@19541 59c8cabf-10d6-4a28-b43f-3936b85956c4
Added general mesh optimizer

git-svn-id: https://geuz.org/svn/gmsh/trunk@19542 59c8cabf-10d6-4a28-b43f-3936b85956c4