* Replaced all from ...py23 import * with explicit name imports, or removed completely when possible.
* Replaced tounicode() with tostr()
* Changed all BytesIO ans StringIO imports to from io import ..., replaced all UnicodeIO with StringIO.
* Replaced all unichr() with chr()
* Misc minor tweaks and fixes
The XML output for other tables is also sorted alphabetically
by glyph name, not by glyph order.
This reverts commit c77e9fe12d5879aeb79c05f8ececebb3275524b7.
Before this change, the AAT lookups were alphabetically sorted by glyph name,
but it seems more natural to write XML in the usual glyph order. No changes to
the binary format (which already was in glyph order); this only affects how
XML output is produced.
The AAT `ankr` anchor point table is an auxiliary table for `kerx`,
used to store anchor overrides in case the glyph itself does not
supply the needed anchors as control points. Among the fonts that
come pre-installed with MacOS 10.12.6, `ankr` is used by a handful
of non-Latin fonts such as “Myanmar MN”, “Devanagari Sangam MN”,
and “Arial HB”.
https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ankr.html
