Add ability to filter the regression test, and improve style
Add ability to filter the regression test, and improve style

gaursagar/cclib,andersx/cclib,Clyde-fare/cclib,berquist/cclib,gaursagar/cclib,jchodera/cclib,andersx/cclib,Schamnad/cclib,ghutchis/cclib,ben-albrecht/cclib,berquist/cclib,ghutchis/cclib,Schamnad/cclib,cclib/cclib,langner/cclib,langner/cclib,jchodera/cclib,berquist/cclib,langner/cclib,Clyde-fare/cclib,cclib/cclib,ATenderholt/cclib,cclib/cclib,ATenderholt/cclib,ben-albrecht/cclib