[Distutils] Commands: init'ing booleans to None

There are a bunch of places in distutils.command where Boolean options are initialized to None; there are other places where they're initialized to zero. Is it worth making this consistent, and always setting them to 0? (I'm currently going through all the commands checking the boolean_opts class variables, so I can change the initializations at the same time.)

--amk (www.amk.ca) "But as the papers say, he's caught the public's imagination." "Didn't know they had any." -- Cops, in ENIGMA #2: "The Truth"