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After exported procedure is called, execute a transition (with the same
name but no parameter) in the state machine

Now all the context, including the state and all DCL variables are
generated as an ASN.1 type
This allows a better interface with external tools in C or Python since
there is a single ASN.1 SEQUENCE variable. There is no need to have a
getter and a setter for each internal variable.

+ other bug fixes

Some errors were only reported on the screen by antlr, Now they are
caught by the tool

standard SDL syntax. Also works with parameterless procedures

ASN.1 constants, when numerical, had to be replaced by their actual value in decision branches, instead of using the range of their type.

to match the taste interface in C

antlr3 for python3 does not print anything on the console anymore