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If enums have big numbers (> int) asn1scc generates their value with LL
suffix. This broke the basic string parser in this script.

augmented AADL grammar
used runantlr aadl.g to rebuild

CHOICE type now have a separate _selection type for the choice
discriminant. This broke the script that extracted the constants from
the .h file generated by asn1scc

dmt/A_mappers/Stubs.py: more python3 compat

Generate .exist.<field> getters and setters
(used by autogenerated guis)

This is used by the automatically-generated GUIs to set/unset optional
fields in SEQUENCEs.

CircleCI 2.0 saga: Finally, use a Docker-container-hosted PostgreSQL (and SQLite) to do the DB testing.

dmt/A_mappers/Stubs.py: Python3 compatibility changes, contributed by cejpmart.