make -p active by default (don't follow hardlinks)

[jerkey]

I feel like this should be obvious but maybe i'm missing something. duff marks hardlinked files as "duplicates" which means that doing the obvious thing - using duff to reduce clutter and delete duplicate files - will result in deleting files with hardlinks (multiple filenames to the same data). I can't think of any reason why this should be the default rather than the opposite. Basically -p should be default, right?

-p Physical mode. Make duff consider physical files instead of hard links. If specified, multiple hard links to the same physical file will not be reported as duplicates.