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_rpc.c

@@ -13,6 +13,22 @@
 #include "pio_interface.h"
 #include "pio_rpc.h"
 
+/* replace once size_t-based version of vlistInqVarSize is merged */
+static size_t
+cdiPioVlistInqVarSize(int vlistID, int varID)
+{
+  int zaxisID, gridID, tsteptype;
+  vlistInqVar(vlistID, varID, &gridID, &zaxisID, &tsteptype);
+
+  int nlevs = zaxisInqSize(zaxisID);
+
+  int gridsize = gridInqSize(gridID);
+
+  size_t size = (size_t) gridsize * (size_t) nlevs;
+
+  return size;
+}
+
 struct clientBufSize
 computeClientStreamBufSize(int streamID, const struct collSpec *collector)
 {
@@ -24,7 +40,7 @@ computeClientStreamBufSize(int streamID, const struct collSpec *collector)
     {
       size_t chunkSize;
       {
-        int varSize = vlistInqVarSize(vlistID, (int) varID);
+        size_t varSize = cdiPioVlistInqVarSize(vlistID, (int) varID);
         chunkSize = (size_t) (ceilf(cdiPIOpartInflate_ * (float) varSize / (float) collector->numClients));
       }
       rmaSizeSpec.numDataRecords += 2;