Migrated Murder to 2.3

[Andreas S. Kerber]

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Just a heads up for anybody trying to update a murder to version 2.3. I've just upgraded several servers
from 2.1.16 to 2.3.14 without major problems. 

As many pointed out before, the backends should be upgraded first. The mupdate master followed and the
frontends where upgraded in the last step. There we're only minor problems, mostly related to my specific
environment:

* Had compilation problems on SuSE 9 due to lacking com_et (needed to install e2fsprogs-1.38)
* Selection of bdb library used to newest library. Configure switches didn't help so I edited configure by hand
* Had to add entry for mupdate service in /etc/services due to: "failed: Servname not supported for ai_socktype" error
* LMTP delivery problems during upgrade from old frontends to new backends (uses another username for authentication)
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