[svn-r3296] Added message about number of reqs in unexpected buffer when we fail to allocate a request for an unexpected message.  This is a more informative message so the user can see why a request was unable to be allocated.

previous commit, r3285.

[svn-r3279] Moved the xFLAGS reset to after AC_PROG_CC, so that CLAGS are used for checking whether the compiler works fine in AC_PROG_CC. Reviewed by goodell.

[svn-r3276] Fixed declarations to use PMPI_LOCAL instead of static (necessary when weak symbols are not supported)

[svn-r3275] Updates for brief-global thread cs support (still requires updates to MPIR_Localcopy) and for new match structure defintion where used within debugging statements

[svn-r3271] Committing the 64-bit optimization code for queue searching. This should make queue searches for the posted queue and the unexpected queue considerably faster for large queue lengths. Reviewed by
buntinas.

allocate and free memory correctly when dealing with PMI key/val lengths.

Reviewed by buntinas@.

[svn-r3266] Added support for the environment variable MPICH_THREADLEVEL_DEFAULT to select the default thread level provided by MPI_Init; among other things, this substantially improves the coverage of the threaded code when set and used with the test suites

[svn-r3265] Added pid to the threadid output because pthread_self does not guarantee a unique id for all threads on a node, just the threads in a process

[svn-r3258] beautified help message for --enable-fast: rearranged options and eliminated wrap-around.

allow valgrind to find more memory errors when mpich2 is configured with
--enable-g=mem,meminit.

reviewed by buntinas@