Make std::set_unexpected and std::set_terminate set global (process)

unexpected and terminate handlers, respectively.  Added pathscale::
versions of both (not exposed in the headers, so not - yet - part of the
public API), which retain the old behaviour and set a thread-local
version.

Also added pathscale::set_use_thread_local_handlers(), which allows the
user to request the thread-local behaviour from the std:: versions.
Also not exposed via a header yet.  The pathscale:: namespace might not
be the most sensible place for these, and some thought should be given
to this before actually making them public.

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