PartPropSvc: patch for bad parsing of input files: GAUDI-1119
In the PartPropSvc, after upgrade to boost::regex, parsing of input files fails silently if no "=" is present in the token (ie file type is not specified), and the file loaded will be the default table instead of the user supplied one.
eg: InputFile = "myPDGTABLE.MeV" will result in "PDGTABLE.MeV" being loaded instead, with no message that this has taken place.
Fixes GAUDI-1119.