This filter extrudes a generating polydata until it intersects
a trim surface. Two inputs are required: the input generating
polydata and the trim surface (also polydata). Options exist
to control the capping process to produce the end cap at the average
intersection distance, maximum intersection distance, minimum
intersection distance, and as intersected.

Further, vtkStaticCellLocator was not thread safe in its line
intersection method, and the locator was not intersecting cells
properly in all cases. The bin - line intersection traversal
algorithm was confusing and non-optimal. Hence the commit
also includes a rewrite of the intersection code to be thread
safe and to use a more efficient bin/voxel traversal method.