Revert "Revert "prepare for texmf -> texmf-dist merge in TL 2013""

This reverts commit d412ce25533ff12d05e09c1cdb774e3fd9f2b4c4.
Revert "Revert "texmf-dist instead of texmf for TEXMFCNF, too""

This reverts commit 09326d314f230f3264b0fb9c4c96ced6f06245c7.
Fix extensible accents when current font ≠ accent font

A typo caused glyph nodes for extensible accents to use the current font
instead of the font of the accent, can be manifested when different
fonts are used.

Reported on the mailing list:
http://tug.org/pipermail/xetex/2013-April/024310.html
Bump version number