[p4] Upgrading perforce from 2004.2 to the latest version

[Robert Cowham]

> If you really want to know how long it will take, and if 
> there are any caveats, I recommend that you copy your latest 
> checkpoint and source archives to a test server, and run 
> through the upgrade process.  Contact Perforce if you need an 
> extra license for your test server, so you may then exercise 
> the upgraded server to see if there are any noticeable issues.

I always recommend this - saves possible embarrassment, and allows some
testing to make sure nothing nasty will happen.

Because you are skipping the versions with db.archive, you won't incur the
overhead of that upgrade which was an unpleasant surprise if you didn't know
about it (e.g. previous upgrades p4d -xu took minutes, that one took hours
in some cases).