[XeTeX] Vertical writing of CJK and fontspec (rawfeature=vertical) misbehaving

[Michiel Kamermans]

An apology. After lots more websearching and discussion reading, I went 
opentype tag hunting and came up with a combination that almost solves 
the problem (using Vertical=RotatedGlyphs and 
RawFeature=+fwid;+vrt2;+vkna;+vpal), but it's still not quite right - at 
least from what I can tell from my short Japanese example, the character 
日 is still malaligned (too far too the left rather than centered on top 
of 本).

It also leaves the fact that the "vertical" argument that can be passed 
to fontspec should probably be called "rotated", instead. Unless it 
internally also checks whether vertical tags are used, in which case it 
might be checking for vert, but not vrt2 (which is apparently a superset 
of vert).

- Mike