Making config file parser available to add-ins

I want Veil (http://pgfoundry.org/projects/veil/) to be able to read
configuration details from a configuration file.  Rather than implement
my own config file parser, I'd like to be able to re-use the parser
defined in guc-file.l

If this is not contentious, I will submit a patch to make the parser
available to add-ins.

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Marc