Planner: Report CNS and OTU

In add_plan_to_notes(), call update_cylinder_related_info() to compute
CNS and OTU data for the planned dive. Report their values in the notes.

Besides CNS and OTU, update_cylinder_related_info() also recomputes the
SAC, which is harmless. Note that both dive->cns and dive->maxcns need
to be zeroed out for the CNS value to actually be recomputed.

Signed-off-by: Gaetan Bisson <bisson@archlinux.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>