logwipe: use argv[0] as program name
logwipe: update error messages
logwipe: use strptime()
logwipe: update usage
logwipe: reindent main
logwipe: clean up wipe_utmp[x]()
logwipe: clean up wipe_wtmp[x]()
logwipe: be more verbose about erased entries
logwipe: pay attention to field size
logwipe: clean up wipe_lastlog()
logwipe: clean up wipe_acct()
logwipe: wipe_acct: copy without a temporary file
logwipe: whitespace
logwipe: nuke now-unused copy_file()