[tex-live] mention changed luaotfload features in TeX Live guide ?

[jfbu]

Hi,

the TeX Live guide already mentions regarding LuaTeX ``Sweeping
changes to primitives, both renames and removals,...''

Also luaotfload is undergoing important changes (in my limited
experience, it is much much faster) including removal of
previously supported features.

https://github.com/lualatex/luaotfload/blob/master/NEWS

* Remove support for builtin Fontforge libraries (this includes
  the PFA, PFB, DFONT, and feature file readers).

As mentioned by Bruno Voisin on TeX on Mac OS X list
(https://email.esm.psu.edu/pipermail/macosx-tex/2016-April/date.html
but not yet updated), this is particularly relevant to mac os x
users as legacy system font Times, Helvetica, Courier, Monaco,
Geneva, Helvetica Neue are in DFONT format.

Naturally, this is in state of flux, as the luaotfload repo is
actively maintained. Perhaps the removed features will be
re-implemented in Lua.

But in case some previously working things are really removed,
probably TeXLive guide could contain brief mention of it to the
unwary.

Jean-François