changed 'zero' value and added 'title' argument to plot()
added messages when orthotropic case is forced or when a given constitutive matrix is passed
fixed clpt_donnell_bc4 and added linear buckling with combined load cases
fixed clpt_donnell_bc4
added linear buckling for combined load cases
renamed fsdt_donnell5 to fsdt_donnell_bcn and the corresponding sanders
zero value changes, fixed K_phi_t, renamed fsdt_donnell5 to fsdt_donnell_bcn and the corresponding sanders
renamed fsdt_donnell5 to fsdt_donnell_bcn and the corresponding sanders