* Finance Minister proposes debt swap, growth-linked bonds * 10-year bond yields on track for biggest fall since 2012 * Greek bank stocks buoy Athens' shares * ECB, IMF may exit troika - Handelsblatt (Adds comment) By John Geddie LONDON, Feb 3 (Reuters) - Greek bond yields plunged and stocks rallied on Tuesday as the new government in Athens appeared to soften its stance on a debt writedown with ...