fix match_plane_by_dir() for 2D meshes
fix match_plane_by_dir() for 2D meshes

BubuLK/sfepy,sfepy/sfepy,vlukes/sfepy,BubuLK/sfepy,sfepy/sfepy,rc/sfepy,rc/sfepy,vlukes/sfepy,vlukes/sfepy,BubuLK/sfepy,sfepy/sfepy,rc/sfepy