first cut at reducing the boilerplate in api doc entries: Prototype, Stack, and Summary are pretty self-evident; Example and See also are still left as headings
restore headings to markup for better text browser compatibility, but add classes for them so that css hacks can be used for layout tweaks
layout prototype for api sections with wide window
Fix API entry heading vertical alignment

Styling changes necessary to make the API entry headings (such as
'Prototype' etc) to align vertically when browser window is wide.
Getting the alignment to work requires awkward margin hacks.

Also reimplement CSS styling for stacks to be more simple.
Ditz issue update
Testcases for test262 triggered bugs
Disable incorrect assert in numconv
Use def_prop instead of put_prop in JSON.parse()

With put_prop variant Duktape would incorrectly parse a JSON object
containing a '__proto__' named property.  Such a property must be
parsed as a plain property and must not affect the object's prototype
(ES6 inherited __proto__ property).
Improve misleading error message from duk cmdline
Document JSON reviver corner cases
Add JSON __proto__ reviver corner case test (now fails)

Add more testcases for parsing __proto__ in JSON.  The current implementation
fails when a reviver is really clever and deletes the own property '__proto__'
when called for another property (prior to __proto__).  This is very much a
corner case.
Release note update
Update test262 known issue list: one bug fixed
Merge branch 'test262-assert-fixes'
Ditz issue update
Add internal duk_set_length() call
Fix JSON.parse() array 'length' property

Previous change to use duk_def_prop_xxx() instead of duk_prop_put_xxx()
broke 'length' of parsed result arrays.  Since duk_def_prop_xxx() don't
automatically update 'length', it was left unset.
Change asserts to checks in duk_def_prop_xxx()

Some limitations of duk_hobject_define_property_internal() (which is
ultimately called by duk_def_prop_xxx()) are not obvious and were only
asserted for.  Change the asserts into actual checks so that if there
is a call site which makes an incorrect assumption (perhaps in some
corner case), an error is thrown instead of something unsafe happening.
Merge branch 'def-prop-checks'
Ditz issue update