lib/kernel: intro Numeric::value_of to get a Numeric in the receiver domain

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: add nitunits to Numeric::value_of

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: intro the geometry module

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
Signed-off-by: Romain Chanoir <chanoir.romain@courrier.uqam.ca>
Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
tests: fix nitg-e fixme files with changes to kernel

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

Will be used by QuadTrees, Bentley-Ottman and gammit.

For each geometric concept there is an interface beginning with 'A' and an implementation. Such as the abstract APoint and concrete class Point.

Pull-Request: #442
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>
Reviewed-by: Chanoir <chanoir.romain@courrier.uqam.ca>