0.8.0

0.8.0

The groups carry an order of their own. Sorting a list ordered the tasks
inside each heading and left the headings themselves in file order, so there was
no way to say "alphabetically" and have it mean the groups too.

• A second order, chosen in the same menu: file order, A–Z or Z–A. Organise
  within the groups, and organise the groups.
• Neither sort stands in for the other. A group has no due date and no
  importance of its own, so ordering groups by the task sort would mean
  inventing an aggregate and calling it the group's.
• Dragging a heading now follows the group order rather than the task sort.
  Choosing "Due date" for the tasks had been quietly disabling it, which is a
  question it has nothing to say about.
• Both are view-only and stored per list, like the task sort. Nothing is written
  to your markdown.

Tasks in no group sit below the groups, with Completed below that. They were
above, by the argument that it is where they are in the file — which only held
while the file's own order was the only order there was.

The Ungrouped tasks first setting goes with it: the position is now fixed, and
a setting whose reason has gone is a switch with nothing behind it.

Subtasks are unchanged, and deliberately so — they are never sorted and never
grouped, and stay under the task they belong to.