N3644 tests for map/multimap/set/multiset

[Marshall Clow]

The existing implementations seem to work, so I just added some tests.
The general iterator tests for <map> appeared to be missing, so I added that, too.

-- 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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