Version 1.2
  - Added -o option to handle old or broken wtmp's not created by linux
    itself, such as those created by the tacacs terminal server.
  - Added -t option to handle some ancient format that tacacs apparently
    uses.
  - Added -b for producing a determination of how much login time has
    precisely been used over the last few hours.  Usefull for determining
    if someone has been logged in say the last 4 hours: sac -bp 4 bubba
  - Added -c option to perform login clipping, thus only show how much login
    is really being used by not counting multiple logins as only one login.
  - Handles xterms that work (sorta) by logging login and logout as a user
    process and dead process respectfully.
  - Added --help option to print a verbose usage listing.
  - Added -x userlist for excluding certain users from accounting.
  - Added -u userlist which is the default.
  - Added -T ttylist to perform accounting on only certain ttys.
  - Added --help, -s, -e, -b, and -t options to rawtmp.

Version 1.1
  - Added the -s and -e options for starting and ending dates.
  - Handles time changes that netdate logs in wtmp file (I think).
  - Fixed, err, made more robust, some possible divide by zero errors.
  - Throws out null wtmp entries (where do these come from?)
  - Corrected(?) argument parsing.
  - Added rawtmp command.

Version 1.0
  - The orginal, perfect as it was.
