louisepb/TexGen: TexGen v3.13.1

TexGen software, developed at the University of Nottingham for modelling the geometry of textile structures. TexGen models may be used as the basis of simulations for prediction of a variety of properties, including textile mechanics, permeability and composite mechanical behaviour.

This is a minor release to correct a bug when exporting a voxel mesh to Abaqus with no boundary conditions.