Tetra modification (Ig2_Tetra_Tetra_TTtraSimpleGeom, Law2_TTetraSimpleGeom_NormPhys_Simple, modified GL functor, examples, utils.tetra)
added Ip2_ElastMat_... functors
fixed bug in utils.kineticEnergy for aspherical bodies
Merge branch 'master' of github.com:yade/trunk