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/Makefile.am

@@ -17,7 +17,6 @@ TESTS = \
   test_byteswap_run \
   test_cdf_const \
   test_cdf_transformation \
-  test_chunk_cksum \
   test_cksum_extra \
   test_cksum_grib \
   test_cksum_grib2 \
@@ -25,6 +24,7 @@ TESTS = \
   test_cksum_nc \
   test_cksum_nc2 \
   test_cksum_nc4 \
+  test_cksum_nc_chunk \
   test_cksum_service \
   test_f2003 \
   test_month_adjust \