Fix to inconsistent slot index bug; check and log output for inconsistent indices.
Storyline facet mode uses context query instead of global query.
Fixed multiple storyline node selection.
Avoid doing some of the storyline drawing preparation twice.
Don't keep storyline selection after clear from constraint box.
Storyline selected nodes are indicated visually.
Storyline vis cluster selection updates if the vis clusters change.

That is, if the view changes, any selected vis clusters that don't exist any more are removed from the selection. Vis cluster identity for this purpose is by year and unique data cluster set.