lib: intro the insert_sorted method

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
tests: intro test for insert_sorted

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: intro Comparator2 and 3

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: intro a bentley_ottmann implementation

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
tests: intro of tests for bentley_ottmann
Merge branch 'numbers' into lines
lib & tests: update bentley_ottmann to use Numbers

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>