A recent selection model change interfered with the ability to edit
the Y-axis of control points.

Sometimes the situation could arise where a log ID referred to by a
log entry's property list coincided with the temporary log ID
associated with the object being created--usually resulting in an
immediate segfault. Assigning the final log ID BEFORE setting the
properties prevents this from happening.

Also, fix journalling bug in region splitting.

Also, fix bug in soloing when a solo'd track was removed.

This race resulted in the failure to consistently redraw new captures
in the proper color.