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_id_set.h

@@ -9,6 +9,7 @@
 #include <stdlib.h>
 
 #include "cdi.h"
+#include "error.h"
 #include "dmemory.h"
 
 struct idList