v0.6.14

feat: Auto page splits PGNs by instance + F1/F2/F3 arrange its boxes

- AutoPageBuilder now keys boxes by (pgn, source, instance), so a PGN that
  reports several Instances from one source (e.g. several engines on src 104)
  gets one box per instance instead of one whose values jump. The box title
  gains "· Instance X" after the src; PGNs without an Instance field are
  unchanged. Widget ids carry the instance so they stay unique.
- F1/F2/F3 now work on the Auto tab: it has no section grid (it's one view of
  many PGN boxes), so there the keys arrange those boxes into 1/2/3 columns
  (same effect as Shift+1/2/3). On the Main tab they still set section columns.

Bumps to 0.6.14.