[relate] fix special case of L/L and L/A - going out and in on the same point but with different segment.

Linestring going into the exterior of the second geometry and then going inside on the same point. In this case the exterior wasn't taken into account. Now in addition to the Point, seg_id is checked. The check should also be faster since integral segment ids are checked before Points.
exit_watcher methods now take Turn instead of Point, seg_id and other_id.
Also added some tests for non-simple A/A.