This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
simplest thing is to just calculate the days using curtime - boottime / 86400.
The modification for this is less obtrusive anyway.
Suggested by: Bill Fenner <fenner@parc.xerox.com>
that if you do an rup on a machine that's been running longer than a year,
you get the wrong day count. Now we factor in 365 * (curtime.tm_year -
boottime.tm_year) to get the correct value. (I noticed this while running
rup on a SunOS machine I have that's been up 525 days. My FreeBSD
machines all said it had only been up for 160 (525-365) days. :)
