Disable interrupt counter for 1.0 release

There is no API to use it, so it's pointless to enable it for now.
Hide doc for DUK_OPT_NO_INTERRUPT_COUNTER (unused)
Release note: disable interrupt counter
Merge branch 'disable-executor-interrupt'
Ditz issue update
Use test262 snapshot from its GH repo

The old HG repo seems to have migrated to GitHub.
Ignore test262.py result in Makefile
Merge branch 'test262-404-fix'
Ditz issue update
Throw stmt fixes: reject empty val, NL before val

Duktape 0.11.0 would allow an empty throw (e.g. "throw;") and would
also allow automatic semicolon insertion between "throw" and its
argument, e.g.::

    throw
    123;

The above must be rejected with a SyntaxError according to E5.1.

Both empty throw and the above newline case are rejected by V8 and
Rhino, so the previous more lenient behavior should not conflict
with real world code.
Bug testcases for empty throw and throw autosemi
Release note: throw stmt fixes
Merge branch 'throw-autosemi-fix'