The problem of incorrect CUT is wrong Pcurve after projection onto cylinder of a small edge orthogonal to cylinder's axis. The result of projection is a line along V direction, but it should be along U.
ProjLib_Cylinder has no specific functionality to build projection in most common case, so it should return "not done" flag to start projection based on curve approximation.
Following changes are done:
1. ProjLib_Cylinder returns isDone=false in the following cases:
* the projected line is not parallel to cylinder's axis
* the plane of projected circle is not orthogonal to cylinder's axis
2. Test case added
Minor correction of test case
758bacbb66