git-svn-id: https://geuz.org/svn/gmsh/trunk@20152 59c8cabf-10d6-4a28-b43f-3936b85956c4
Modified JacobianBasis to improve portability 

git-svn-id: https://geuz.org/svn/gmsh/trunk@20153 59c8cabf-10d6-4a28-b43f-3936b85956c4