ipfire theme: Use div align for center

Revert change to make openbox produce validating html,
when center alignment for box is wanted.

I have not been able to find css solution for
properly aligning the div horisontally.
qos and process graphs: avoid random colors

For the graphs for qos classes, and for process
count and memory usage, the colors change on
each page reload, since the colors are currently
totally random.

This change uses defined color indexes, 15 different
ones, that should be enough for qos at least, and is
enough for processes on my setup. This makes
the colors consistent between page loads, so it makes
it easier to monitor changes.

Perhaps one should define 30 different colors meant
to be used for graphing, then one could avoid random
colors also for the sensor graphs, and make it less
likely to get color collision for the process graphs
as well. Defining 30 such colors is not part of this
change.
Revert "Firewall: Fix errormessages on rulecreation when red has no IP"

This reverts commit f942937c29ca76a7f153fc16ea13157eb4cf05cc.

This completely destroys external access rules and is therefore
reverted.
firewall: Call firewallctrl with full path.
Merge branch 'next' of ssh://git.ipfire.org/pub/git/ipfire-2.x into next
openvpn: Provide a basic set of configuration settings.

These are the defaults as in the CGI script, but when you don't
set up the roadwarrior server, the configuration file remains
empty and the openvpnctrl binary will end itself because it cannot
read a proper configuration.
Merge remote-tracking branch 'alfh/bugfix_openbox_center' into next
Merge remote-tracking branch 'alfh/feature_graph_constant_color' into next