NULL iterators for <list>

[Marshall Clow]

http://std.org/jtc1/sc22/wg21/docs/papers/2013/n3644.pdf  says that value-initialized iterators should compare equal.

Implement that for std::list.

There are interactions with libc++'s debug mode; hence the extra tests.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki

 
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