rbc_vec constant time improvement

• rbc_vec_set_random_full_rank_with_one : 1 is always in the last coordinate (specified in the doc). Check implication within random_from_support.
• rbc_vec_set_random_from_support : Problematic if size < support_size, to be documented.
• rbc_vec_echelonize : No constant-time variant

changed milestone to %RBC v1.1

changed the description

changed the description

changed milestone to %RBC v2.0

added Constant-Time Issue label

changed the description

changed milestone to %RBC v2.X

changed milestone to %RBC v1.3

closed

mentioned in merge request !43 (merged)

mentioned in commit 4d58a16e