LogFile: clean up imports (we don't need to check stuff below Python 2.6
LogFile: clean up imports (we don't need to check stuff below Python 2.6

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