#1 slightly more helpful error

[um_gabi]

while sassy error messages are cute, helpfulness tends
to be low. We were getting the 'who are you?' message
when trying to set up beepage as a mailer on a new
machine, and could not figure it out without looking at
the code to see what caused that text to be output.

It turned out to be caused by a missing password entry
for the uid trying to send the page.... what uid? who
knew... so I added my text, which provides the uid of
the mysterious 'who'. I might suggest changing the
error message completely to "Missing password file
entry for uid %d"

[um_gabi]