Sketch parray inconsistent start angle and rotation convention

[lorenzncode]

s = cq.Sketch().parray(20, 20, -50, 8).circle(0.5)

Result (master):

Compare parray with arc start angle and rotation and face rotation.

r = 20
a1 = 20

s = (
    cq.Sketch()
    .parray(r, a1, -50, 8)
    .circle(0.5)
    .reset()
    .arc((0, 0), r, a1, -70)
    .rect(r * 2, 1, a1)
)

Result (master):

I had expected the following result.:

I think this might be a minor issue left from the initial Sketch implementation. Perhaps parray can be changed similar to #939 where rect was found to be 90 degrees off from expected?

[adam-urbanczyk]

Absolutely, this needs to be fixed to be consistent with arc.