Uniformization of class call in fields.

Signed-off-by: Victor Berger <victor.berger@polytechnique.org>
Bases of FkzGroup system.

Signed-off-by: Victor Berger <victor.berger@polytechnique.org>
Correcting Makefile and improving .gitignore.

Signed-off-by: Victor Berger <victor.berger@polytechnique.org>