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[svn-r7012] replaced NMPI_[i]Send, [i]Recv, Wait[all] and Test with MPIR__impl, or directly called MPID_ functions.  Reviewed by jayesh@

This is actually several logical changes, but they are very difficult to
separate into individual commits because of how tangled the old macros
were.  Some of the changes are:

- general macro cleanup: do{}while(0) and whitespace issues
- add support for compiler-assisted thread-local storage (TLS)
- make MPID_Thread (e.g. pthread) TLS macros easier to understand and use
- drop non-portable parentheses from MPIU_ISTHREADED macro
- eliminate the MPID_CS_* family of macros which were simultaneously
  complementary to and in conflict with the newer MPIU_THREAD_CS_*
  macros

No reviewer.

SERIALIZED protection. Looks like runtime protection is not sufficient
because the MPIU_Thread symbols are not even available when compiled
in thread-single mode. This is a short term fix, and can be reverted
when ticket #621 is fixed.

fail.

were just lucky earlier. This showed up with dllchan.

Reviewed by goodell.

recommendation.

thread waiting around for a request that only completes at
MPI_Finalize time. Fixes ticket #917.

Reviewed by goodell.