qt5.1 diff cleaner

#This strips out the benign changes of QT_HEADER and (c)2013 from the diffs
BEGIN { useful = 0; output="";
    ignore["-QT_BEGIN_HEADER"] = 1;
    ignore["-QT_END_HEADER"] = 1;
    ignore["-** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies)."] = 1;
    ignore["+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies)."] = 1;
}
/^-[^-]/ { if (!($0 in ignore)) useful = useful + 1 }
/^+[^+]/ { if (!($0 in ignore)) useful = useful + 1 }
/^diff/ { if (useful > 0) { print useful output }; useful = 0; output="" }
 {output = (output "\n" $0)} #records all lines
END { if (useful > 0) print output}