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_cksum_asynch.test.in

@@ -3,7 +3,7 @@
 pio_write_args="-p PIO_ASYNCH -w 3"
 mpi_task_num=7
 
-. ./pio_write_run_parallel.test
+. ./pio_write_run
 ( . ./pio_write_dist_array.test ) || test $? -eq 77
 #
 # Local Variables: