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meshSearch: Prevent hang in calculation of line-boundary intersections
This fix changes how the intersections loop ignores previously intersected faces. It now marks them by their index so that subsequent iterations ignore them. Before this change, after an intersection was found the start point was advanced by a small amount to move the past the intersection. The problem with this was if multiple boundary faces or the end point were in close proximity to the intersection then the move forward might span them. This could lead to intersections being missed or counted multiple times, in some cases indefinitely. Based on a patch contributed by Mattijs Janssens Resolves bug report https://bugs.openfoam.org/view.php?id=1147
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