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- an extra "end if" was generated in some cases when using continuous
  signals
- when generating the simulation script, lower the process name as gnat
  generates only lowercase .o files

Don't do anything at elaboration

the Makefile.Python would not regenerate dataview-uniq.h if the file is
already there, but for the python backends we must not have the asn1scc
prefixes

Was missing elsif statements

...to support properly state aggregation and composition.
Clustering of graphs has to be handled manually because of graphviz
limitations.

in Helper.py, the propagate_inputs function was not adequate in the case
of state aggregations