o The status of a well is maintened as a small object which is managed by a new
std::shared_ptr member in the well objects. The consequence of this is that
several well objects can share the same underlying status object. The
advantage of this is that runtime (i.e. ACTIONX) updates of well status will
affect the correct set of wells.
o The general Schedule::updateWell() will use the DynamicState::upadte_equal()
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