• Align MATH AxisHeight with minus and similar operators.
• Align single and double arrows to minus and equal signs.
• Fix Celsius, Fahrenheit and Ohm signs to take the style of their fonts.
• Fix Ohm sign side bearings.
• Fix Service Mark and Trade Mark in sans fonts to take their style.
• Unify the default for of Eng glyph across fonts, and add and alternate shape
  for Sami language.
• Fix Cyrillic small letter ef in display font to match the regular serif font.
• Dropped some more unused PUA slots.
• The copyleft symbol now used the proposed Unicode 11 code point.