Merge master back into tables/ueb

Conflicts in tables/en-ueb-chardefs.uti

- dropped changes from ken (commit 70184e72d7) because already in
  tables/ueb

  midendword ity 56-13456
  noback sign . 46

- added changes from paul (commit 55a899bb81)

  math \x00BC 3456-1-34-145
  math \x00BD 3456-1-34-12
  math \x00BE 3456-14-34-145
  math \x00D7 5-236
  math \x00F7 5-34

- added changes from paul (commit 7f7132ed04 & 7c96b1828d), but
  commented out if there was already a corresponding rule in tables/ueb

  lowercase \x00E0 45-16-1
  ...
  lowercase \x00FF 45-25-13456
  uppercase \x00C0 45-16-1
  ...
  uppercase \x00DE 3456-2346