alpha joins the pack

A suprise UPS delivery today turned out to be an Alpha. Thanks, Matt! It was tricky to get it to netboot. None of the three tftp servers in Debian now work for all arches I have:

tftpd: does not support i386 pxelinux
tftpd-hpa: does not even respond to my alpha's tftp packets
atftpd: fails on alpha and hppa

So now I have two tftpd servers on my test network.

Anyway, already managed to fix some small bugs in d-i on alpha and in the next day or two, I hope to add fully automated install testing on alpha to the other 5 arches.