After changing `Tracker::web` in
`/opt/roundup/trackers/[tracker]/config.ini` (after setting up
`roundup-admin install`) starting the webserver with `roundup-server
tracker=/opt/roundup/trackers/tracker` causes the server to be started
at `http://localhost:8080`.

I'm setting up a roundup instance following
http://roundup-tracker.org/docs/installation.html.

Hi Karl-Phillip,

when calling roundup-server -h
you will see that localhost:8080 is the default for -n and -p parameters.

Note that the url that is configured by "Tracker:web" is for what 
roundup is sending out where is can be reached.

The -n and -p options are for specifying the listening interface
and port number of the web server. In more complicated setups, they
may be different from the url that is displayed, so the settings are
separate. For demo.py Tracker:web is taken to fill -p and -n automatically.

Do you think we should improve this in the document or in the code?
Any idea where ?

Updated installation.txt with example using all interfaces on the host
with port 1080. Also updated roundup-server man page with default value
for -n and documented using -n 0.0.0.0 for binding to all interfaces.

commit: c54720396f40