free function sweep BRepOffsetAPI_MakePipeShell option to SetMode

[lorenzncode]

I did not expect this result from the sweep.

import cadquery as cq
from cadquery.occ_impl.shapes import *

path = cq.Wire.makeHelix(2, 6, 4)

e1 = segment((4, 0, 0), (4, 0, 0.5))

res = sweep(e1, path)

I got the expected result after changing the sweep function to call builder.SetMode(True) here:

cadquery/cadquery/occ_impl/shapes.py

Line 4956 in 3cd327a

builder = BRepOffsetAPI_MakePipeShell(spine.wrapped)

Perhaps this can be set by default, or optionally as a function argument.