[pkg-kolab] Apt install Kolab server Debian unstable

[Price,Neil]

> Geordie, if you want kolab to work quickly, try with lenny, and apt
> pinning (see 
> https://wiki.kolab.org/index.php/Debian_-_Administrators_-_Kol
> ab_Installation).

I'm testing on Lenny... it works well. Even Horde looks good.

I did find I had to install postfix (which uninstalls Exim4) before
following the above instructions. This avoids a bunch of confusing
dependency problems, I don't know why.