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/stream_cdf_time.c

@@ -178,7 +178,7 @@ cdfDefTime(stream_t *streamptr)
 #ifdef HAVE_NETCDF4
   if (timeDimLen == NC_UNLIMITED && (streamptr->filetype == CDI_FILETYPE_NC4 || streamptr->filetype == CDI_FILETYPE_NC4C))
     {
-      const size_t chunk = 512;
+      static const size_t chunk = 512;
       cdf_def_var_chunking(fileID, timeVarId, NC_CHUNKED, &chunk);
     }
 #endif