Find the discontinuities along a curve.

Input parameters:

1. Cr → Curve to analyse.
2. Lv → Highest level of discontinuity to report.
   • 0 → G0 Position
   • 1 → G1 Tangency
   • 2 → G2 Curvature
   • 3 → G3 Jerk
   • 4 → G4 Yank
   • 5 → G5+ Smooth
   • 6 → G∞ Infinite
3. En → Include the ends of open curves.
   •  True → Include
   • False → Exclude

Output parameters:

1. Lc → Loci of all curve discontinuities.
2. Lv → Level of discontinuity at each locus.
   • 0 → G0 Position
   • 1 → G1 Tangency
   • 2 → G2 Curvature
   • 3 → G3 Jerk
   • 4 → G4 Yank
   • 5 → G5+ Smooth
   • 6 → G∞ Infinite
3. Dt → Text dots at all discontinuities.