Consolidation with CDI-PIO (develop)

Generally, this is !11 (merged) rebased onto the develop branch.

This is the first develop-based version accepted by the Buildbot of ICON: https://buildbot.dkrz.de/grid?branch=m300488/cdi-pio-2-integration

src/pio_mpi_fw_at_all.c

@@ -42,8 +42,8 @@ initAFiledataFileWriteAtAll(const char *filename, size_t bs)
   MPI_Comm commPio = commInqCommPio();
   int sizePio = commInqSizePio();
   size_t nameSize = strlen(filename) + 1;
-  struct fileMPIFWAA *of = Malloc(sizeof(*of) + sizeof(of->collWriteSize[0]) * (size_t) sizePio + nameSize);
-  of->name = (char *) ((unsigned char *) of + sizeof(*of) + sizeof(of->collWriteSize[0]) * (size_t) sizePio);
+  struct fileMPIFWAA *of = Malloc(sizeof(*of) + sizeof(of->collWriteSize[0]) * (size_t) sizePio);
+  of->name = Malloc(nameSize);
   memcpy(of->name, filename, nameSize);
 
   MPI_Info open_info = MPI_INFO_NULL;
@@ -81,7 +81,8 @@ destroyAFiledataFileWriteAtAll(void *v)
   xmpi(MPI_Allreduce(MPI_IN_PLACE, &trailingOctets, 1, MPI_INT, MPI_LOR, commPio));
   if (trailingOctets) xmpi(MPI_File_set_size(of->fh, endpos));
   int iret = MPI_File_close(&of->fh);
-
+  Free(of->name);
+  of->name = NULL;
   Free(of);
 
   return iret == MPI_SUCCESS ? 0 : -1;