Make linerva easier to install

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We should get all the packages for running Linerva into an apt repository, which should make installation much easier. This blocks on #51.

PREP: get keytab and setup a stock etch VM
This probably involves:

• make basic repository in someone's home directory and build+upload the linerva, linerva-perl, linerva-master, linerva-pam-config, and linerva-chroot (#51) packages to it.
• test installation via apt
• compare /etc to running linerva.
• packages unpackaged changes like /etc/shells that become obvious from the previous step.

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debathena-athmode-sendmail is now toast, so at this point I believe there are no major components that are not packaged. We should do another testing party on an i386 test machine at some point.