This eliminates spurious warnings from helgrind/drd about fields in
MPID_Request that obj->next aliases.

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Originally broken by r6919.

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e.g., fork.

The sendselfth and ctxdup tests exhibited the bug most clearly.

Reviewed by buntinas@.

The send and recv buffers aliased each other in an "in place" fashion,
yet MPI_IN_PLACE was not used.  Thanks to Joe Ratterman @ IBM for the
bug report.

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Thanks to Joe Ratterman @ IBM for the bug report.

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This required moving CHKMEMCPYANDSTMT above the "/* --BEGIN ERROR MACROS-- */"
line.  This lets maint/extracterrmsgs know that **memcpyalias is
actually used and avoids an "(unknown)(): Internal MPI error!" message
when memcpy arguments are aliased in MPIR_Localcopy.

Also fix a format string mismatch.

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Allows specifying the errnames.txt file on the command line without
specifying the whole src/mpi/errhan directory.

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[svn-r6949] Added Mac OSX Darwin to known architectures for ROMIO.  This eliminates warnings about unrecognized architecture when building ROMIO

[svn-r6948] Thread id type is defined only if thread level is >= THREAD_SERIALIZED, so define cs_holders -added in r6911- only in that case

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[svn-r6940] Replaced enable_fc=default setting by enable_fc=yes and set enable_fc=no if any Fortran90 test fails.  Guarded all AC_PROG_[CC|F77|FC|CXX] so none of the *FLAGS would be set -g -O2.  Eliminated duplicated PAC_PROG_FC/PAC_PROG_FC_WORKS caused by inconsistent use of enable_fc=default.  Moved AC_PROG_[CC|F77|FC|CXX] right before the corresponding language tests to improve readability of the code.

[svn-r6939] bug fix:  the communicator wasn't passed to the err_return function, so we weren't checking whether to return errors or abort

This commit may be slightly conservative in some of the pt2pt code, but
it is not obvious that persistent requests handles don't need to be
published safely.  Until it is proven otherwise, we will take the
write memory barrier hit (on some platforms).

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[svn-r6937] add MPIU_OBJ_PUBLISH_HANDLE macro to enable lockfree access to read-only MPI object fields

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Fine-grained multithreading still breaks dynamic processes in a pretty big way,
but at least the test suite passes a bit more reliably with these in place.

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This suppresses warnings about defined but not used.

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