This is the second round of bug fixes to the TeX Live 2016 edition of

Luaotfload.

* Update the fontloader with Context version 2016-05-01 09:57:00.
* Fix a number of crashes in letterspacing and font handling.
* Allow configuration of the default (anonymous) lookups.
* Handle unsupported versions of Luatex gracefully instead of crashing.
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