Planner: Show gas changes at the correct depth.

Gas changes (can) have a bogus waypoint following at the same depth with 0
time. Those were confusing the decision whether to show a waypoint.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Planner: add a few more line breaks in the html notes

This looks much better now.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Planner: make the warnings visually stand out more

HTML is nice here.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>