This commit actually does a few things to the status object:

(1) `int count` becomes `MPI_Count count`;
(2) `count` & `cancelled` have been reordered after the "public"
fields (e.g., MPI_TAG) to ensure that direct access from Fortran is
not somehow broken by the (potentially) non-INTEGER count field;
(3) and a new future-proofing field, `abi_slush_fund`, has been added to
attempt to allow us to add fields to the status object in the future
without having to break ABI compatibility.

There's still too much duplication of the status object's contents/layout
in multiple pieces of the code, but I don't see a reasonable way to fix
this in the near term.

Warning: large count breaks the experimental Fortran binding code
generated for handling the "sizeof(int)!=sizeof(MPI_Fint)" case.

Reviewed by balaji@.

This commit is largely auto-generated boilerplate for the following
"large count" routines:

* MPI_Get_elements_x
* MPI_Type_get_extent_x
* MPI_Type_get_true_extent_x
* MPI_Type_size_x
* MPI_Status_set_elements_x

None of these routines actually _do_ anything (not even assert/error
out) as implemented.  But this makes it very easy to review the logic of
the implementation later on in the succeeding smaller commits.

Reviewed by balaji@.

This commit only contains the build system and mpi.h modifications
necessary for `MPI_Count` to be a valid new type.  It does *not*
actually use this new type anywhere, such as in MPI_Status.

Reviewed by balaji@.

Currently unused, but we should probably be using these in more places
for overflow checks.

Reviewed by balaji@.

The old rule would just bomb out with a cryptic "Error 1".  Now
we cat the error message file so that you have some idea of what
actually happened.

Reviewed by balaji@.

Test cases to ensure that RMA ops on shared memory windows are behaving
correctly.

Reviewer: balaji

Added immediate locking (needed to support load/store access) and memory fences
(to support third-party load/store communication).

Reviewer: balaji

Reviewed by robl@.

Duplicated r10523 error checking updates to non-req. acc/gacc into the
request-based operations.

Reviewer: none

1. Make the manpage entries consistent with the function prototype.

2. Consistently use "Parameters" instead of the inconsistent
"Parameter" and "Parameters" usage.

3. Correct the manpages for MPI_Type_get_contents and
MPI_Type_get_envelope.

Reviewed by dinan.

for MPI_Type_create_f90_{integer,real,complex}.

Reviewed by dinan.

Made a cleanup pass on mpi.h.in and the function definitions to make
mpi.h.in consistent with the MPI standard.

1. The usage of "*" vs. "[]" was not consistent with the MPI standard
(aside from the consistency changes added in tickets 125 and 126 in
MPI-3).  This commit makes this notation consistent.

2. Consistently provide function parameter names for all MPI
functions.  Some functions had parameter names, while others did not.

3. Consistently use line-breaks for all function prototypes.  Some
prototypes were on a single line, while others were split across
lines.

4. Reorder prototypes to better place them in sections (e.g., all
collectives go to the same section).  Move all PMPI definitions to the
PMPI section.  Move all MPIX_ extension functions to the same section.

The following prototypes are different from that given in the
standard; we use "indx" instead of "index" or "binding" instead of
"bind", to avoid conflicts with preused variable names: MPI_Waitany,
MPI_Testany, MPI_Graph_create, MPI_Graph_get, MPI_Graph_map,
MPI_T_enum_get_item, MPI_T_cvar_get_info, MPI_T_pvar_get_info.

Reviewed by dinan.

Reviewed by dinan.

notation to match the MPI-3 standard: io.

Reviewed by dinan.

notation to match the MPI-3 standard: mpi_t.

Reviewed by dinan.

notation to match the MPI-3 standard: topo.

Reviewed by dinan.

notation to match the MPI-3 standard: pt2pt.

Reviewed by dinan.

notation to match the MPI-3 standard: groups.

Reviewed by dinan.

notation to match the MPI-3 standard: error handlers.

Reviewed by dinan.

notation to match the MPI-3 standard: datatypes.

Reviewed by dinan.

notation to match the MPI-3 standard: collectives.

Reviewed by dinan.

notation to match the MPI-3 standard: attributes.

Reviewed by dinan.

This patch adds missing attributes to MPI-3 RMA functions.  Patch provided by
Dmitri Gribenko.

Reviewer: dinan

Updated RMA code to remove trailing "_e" and "_s" on enum and struct type
names to match the MPICH style.

Reviewer: goodell

Reviewer: balaji

Code review cleanups that couldn't be merged into earlier patches because of
later changes.

Reviewer: goodell

Temporarily reduced the communication volume in manyrma2.  For right now, it's
valuable to get correctness testing from this test.  We are still tracking the
performance issue under #1669 and will tackle that for the next release.

Reviewer: goodell

Reviewer: goodell

Updated get_accumulate implementation to properly handle NO_OP operations;
currently, we dispatch these as get operations.  As a part of this change, the
op issue code was also gathered into a macro to reduce copy-paste across all
of the synchronization functions.

Reviewer: goodell

Removed scattered initializations of the RMA op dataloop field that are
redundant, since the dataloop field is now initialized when the op is
allocated.

Reviewer: goodell

Fetch-and-op has been updated to ignore the origin data and perform no
operation when the given op is MPI_NO_OP.

Reviewer: goodell

Updated op error checking routines to check for correct usage of MPI_Op
argument in accumulate and reduce operations.  Also updated a handful of other
error checks in accumulate ops, and corrected some to ensure that origin
arguments are ignored in the GACC/FOP NO_OP case.

Reviewer: goodell

Reviewer: balaji

Reviewer: buntinas

Reviewer: buntinas

Reviewer: goodell

Removed calls to higher-level MPIU_RMA_CALL() macro.  This macro dispatches
either from the RMAFns table or directly to the MPID_ function; since CH3
always uses the RMAFns table, this macro shouldn't be used inside of CH3.

Reviewer: balaji