Fixes an obscure bug, which happened under very specific circumstances.
Precodition: fresh program start and neither of the partial pressure
graphs, nor the heat maps are shown. User clicks on heat map icon.
Bug: The heat map is not shown at the bottom of the graph.
The fix consists in replacing two percentageAxis->setLine() calls
by precentageAxis->animateChangeLine() calls.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
178dcbc0c6