change internal syntax and defaults for parametric surfaces
change internal syntax and defaults for parametric surfaces

stardust66/math3d,ChristopherChudzicki/math3d,stardust66/math3d,stardust66/math3d,ChristopherChudzicki/math3d,stardust66/math3d,ChristopherChudzicki/math3d,ChristopherChudzicki/math3d