safety
New schema for specifying columns that a calendar should have.

There ought to be some way to change this from within the UI, preferably player-friendly, along the lines of 'click a thing, get its schedule'.
safety
safety
multi-column calendars at least drawing again, though the new timeline is useless
Things look about right.

To go further with the calendar I need to implement automatic branch-starting.
Merge branch 'calendar'
I now have a graphical widget to indicate how branches are related.