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

tests/pio_write.run.in

 #!@SHELL@
 
-prefix=${0##*/}
+prefix=`echo "$0" | sed 's@.*/@@'`
 suffix=${suffix-grb}
 
 if ${mpi_task_num+:} false; then