LWG Issue 2097: packaged_task constructors should be constrained

[Marshall Clow]

http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2097

thread was already done; make corresponding changes to packaged_task.
Add tests for both thread and packaged_task.

-- 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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