Add programs.ssh.extraConfig option
Don't try to guess the location of the NixOS config file

The NixOS config need not be $NIXOS_CONFIG, it can also be set through
-I nixos-config=... or not exist in a separate file at all (e.g. in a
NixOps deployment).

Issue #212.
Fix spelling

Also, it's not necessary to order a unit after "sysinit.target" since
that's implied.
Build 32-bit VirtualBox image

Issue #200.
Add vdi.i686-linux to the release-critical jobs
Add some more missing uids/gids
Move the compose-cache code from kde4 to xsession since it is supposedly useful for all X-based stuff.
Fix description for PowerManagement units.
minidlna: Start after networking.target.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Merge pull request #235 from the-kenny/fix-minidlna

minidlna: Start after networking.target.
info program: use latest texinfo