Ditz issue update
Bug test: Function.prototype.name writability
Make Function.prototype.name writable
Testcase illustrating how to set C func name
Release note: Function.prototype.name writable
Merge branch 'make-func-name-writable'

Make Function.prototype.name writable so that user code can set a "name"
property for Duktape/C functions.  Duktape/C functions don't have a "name"
property by default and a non-writable ancestor prevents creating one.

Fixes GH-79.