add an interface to pass file name (or a symbolic name for the input stream) to the parser for exceptions

When parsing a faulty file or stream, exceptions are often thrown with an empty file names, which are then replaced with in the file_parser_error() constructor. It would help our project a lot, if there was a way to pass the name of the file or a symbolic name of the input stream to the parser functions, so that this field would be filled in in the exception and shown to the user.

Start with the parser functions and the file_parser_error() constructor mentioned in the issue. Trace how input names reach exceptions, then define and implement a way to supply a file or symbolic stream name and verify that parser errors display it instead of .

Written by the indexing model from the issue text.