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Predicate prolog_open_source/2
 prolog_open_source(+CanonicalId:atomic, -Stream:stream) is det
Open source with given canonical id (see prolog_canonical_source/2) and remove the #! line if any. Streams opened using this predicate must be closed using prolog_close_source/1. Typically using the skeleton below. Using this skeleton, operator and style-check options are automatically restored to the values before opening the source. 
process_source(Src) :-
        prolog_open_source(Src, In),
        call_cleanup(process(Src), prolog_close_source(In)).
Arguments:
CanonicalId- is one of (1) a term accepted by prolog:xref_open_source/2, (2) a file name or (3) an already open stream. In the last case, the stream is not closed by prolog_close_source/1.
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