Lots of small changes

- new try on Open O and Schwa
- small corrections in anchor placements
- i.dotless and j.dotless replace encoded glyphs in OT-features
- reference existing sub- and superscripts and smallcaps to various code
points (extended latins)
Some quick and dirty changes

- accent positioning in smallcaps (no anchor work)
- give some greek letters a bit more space
Increase right sidebearing of L