Fixed: Cannot see # of crossings after restoring a session

Boost-related code (SignalNodeUpdate method) needed to be called after
de-serialization of GeoTreeView objects.  Variable 'm_sigNodeUpdate'
belonging to GeoTreeView cannot be serialized, so the problem was
directly related to an invalid 'm_sigNodeUpdate' variable.  Reconnection
of this variable to Boost signal libraries during de-serialization has
fixed the problem.