The goal here is to slowly make animation speed a variable of the
profile widget, not of the global preferences. Currently the code
does some trickeries with setting / unsetting the global animation
speed.
Start by not taking a bool "instant" but a speed in
DiveEventItem::recalculatePos().
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>