Clean up some warnings

Unused variables, more initialization order complaints.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
New profile: improve mean depth line

Show decimal depth and make the line length more appropriate for the dive
profile shown.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Fine tune positioning of temperature and tank pressure lines

Maybe not yet perfect, but better.

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