Determines the manner in which
bad words will be replaced. 'nastyCharacters' (the default) will replace a
bad word with the same number of 'nasty characters' (like those used in
comic books; configurable by supybot.plugins.BadWords.nastyChars).
'simple' will replace a bad word with a simple strings (regardless of the
length of the bad word); this string is configurable via
supybot.plugins.BadWords.simpleReplacement.