[geometry] Extracted segment_ratio_type as a metafunction
just like robust_point_type
[geometry] Use segment_ratio_type metafunction in handle_tangencies,
disjoint, add policy_type to intersection strategy with 2 segments
[geometry] Reverted changes earlier in unit test, this appeared to be buggy
[geometry] Fixed unit test for collinear intersections w.r.t new parameters
[geometry] made SegmentRatio as a template argument for turn_operations,
and therefore for turn_info and many more
[geometry] Added comparisons for segment_ratio's based on float
[geometry] Use side strategy only in relative order
(preparing next commit changing strategy_intersection)
[geometry] Removed commented unused code
[geometry] added boost::long_long_type to test-code debug-string
[geometry] Added RescalePolicy (to get SegmentRatio) to strategy_intersection
Some creations/instances of rescale policy had therefore to be moved