DEP: removed deprecated attempt to calculate the tangent stiffness matrix directly
ENH: added function to return the weights and positions for a trapezoidal integration
STY: PEP8
BUG: fixed pressure for linear and non-linear static
BUG: changed msg to text to avoid error
ENH: added new material properties
ENH: tryout with a different numerical integration scheme
ENH: reuse of composite routines for isotropic
ENH: reuse of composite routines for isotropic
DEV: isotropic routines for clpt_donnell_bc3
ENH: reuse of composite routines for isotropic
DEV: isotropic routines for clpt_donnell_bc3