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

examples/pio/Makefile.am

-noinst_PROGRAMS = \
+noinst_PROGRAMS =
+
+EXTRA_PROGRAMS = \
   collectDataNStreams_serial \
   collectData_serial
 
 if ENABLE_MPI
-noinst_PROGRAMS += \
+EXTRA_PROGRAMS += \
   collectDataNStreams_parallel \
   collectData_parallel \
   compareResourcesArray
 endif ENABLE_MPI
 
 if ENABLE_CF_INTERFACE
-noinst_PROGRAMS += collectData2003_serial
+EXTRA_PROGRAMS += collectData2003_serial
 if BUILD_PIO_FC_PROGRAMS
-noinst_PROGRAMS += collectData2003_parallel
+EXTRA_PROGRAMS += collectData2003_parallel
 endif BUILD_PIO_FC_PROGRAMS
 endif ENABLE_CF_INTERFACE
 
+if with_example_programs
+noinst_PROGRAMS += $(EXTRA_PROGRAMS)
+endif with_example_programs
+examples: $(EXTRA_PROGRAMS)
+
 AM_CPPFLAGS = -I$(top_srcdir)/src
 AM_CFLAGS = $(YAXT_C_INCLUDE) $(MPI_C_INCLUDE)