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>