Create the CombBLAS::SpParMat with the MPI_Comm from the input 'gridinfo_t'.
This prevents a warning/error from CombBLAS about using MPI_COMM_WORLD.

--- a/SRC/dHWPM_CombBLAS.hpp
+++ b/SRC/dHWPM_CombBLAS.hpp
@@ -52,7 +52,7 @@
     {
         printf("AWPM only supports square process grid. Retuning without a permutation.\n");
     }
-    combblas::SpParMat < int_t, double, combblas::SpDCCols<int_t,double> > Adcsc;
+    combblas::SpParMat < int_t, double, combblas::SpDCCols<int_t,double> > Adcsc(grid->comm);
     std::vector< std::vector < std::tuple<int_t,int_t,double> > > data(procs);
     
     /* ------------------------------------------------------------
--- a/SRC/zHWPM_CombBLAS.hpp
+++ b/SRC/zHWPM_CombBLAS.hpp
@@ -52,7 +52,7 @@
     {
         printf("AWPM only supports square process grid. Retuning without a permutation.\n");
     }
-    combblas::SpParMat < int_t, double, combblas::SpDCCols<int_t,double> > Adcsc;
+    combblas::SpParMat < int_t, double, combblas::SpDCCols<int_t,double> > Adcsc(grid->comm);
     std::vector< std::vector < std::tuple<int_t,int_t,double> > > data(procs);
     
     /* ------------------------------------------------------------
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<div class='path'>path: <a href='/guix/log/?id=aca4ebe40ae4b4e280ecb093382daa9ab5bd0ef9'>root</a>/<a href='/guix/log/gnu?id=aca4ebe40ae4b4e280ecb093382daa9ab5bd0ef9'>gnu</a>/<a href='/guix/log/gnu/packages?id=aca4ebe40ae4b4e280ecb093382daa9ab5bd0ef9'>packages</a>/<a href='/guix/log/gnu/packages/iso-codes.scm?id=aca4ebe40ae4b4e280ecb093382daa9ab5bd0ef9'>iso-codes.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/iso-codes.scm?id=aca4ebe40ae4b4e280ecb093382daa9ab5bd0ef9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-11-09 22:08:10 +0100'>2020-11-09</span></td><td><a href='/guix/commit/gnu/packages/iso-codes.scm?id=486512dcec484e0f6903e288a2eb1bb15ac585bb'>gnu: iso-codes: Update to 4.5.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/iso-codes.scm (iso-codes): Update to 4.5.0.
</span></span></td><td>Marius Bakke</td></tr>