Planner prefs: set all ascent rates to 9m/min

9m/min (or 10m/min) is the ascent rate assumed by Buhlmann and navy tables,
and the default of most other planning software and dive computers.

Setting the default to 9m/min allows the default behaviour to be consistent
with "expected" behaviour, but does not prevent the user from changing the
preference.  There is disagreement between some users whether the final ascent
ascent duration should be considered when determining the length of the final
stop.  This change does not alter that at all, but at 9m/min, the difference
is <1min.

See #592

Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>

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