Find all surface edges parallel or anti-parallel with a given direction.

Input parameters:

1. Sf → Surface for edge search.
2. Vc → Direction to match against.
3. Bd → If true, find both parallel and anti-parallel edges.
4. An → Angular tolerance.

Output parameters:

1. Cr → Curves of found edges.
2. Ix → Indices of found edges.
3. Dv → Largest measured angular deviation between the edge and the given direction.