debugging.txt already has the HYPERDB stuff removed.

I generated a new example server config file using:

 roundup_server -p 8017  -u roundup --save-config  demo=/trackers/demo \
    sysadmin=/trackers/sysadmin

and included it verbatim (including keyword explanations) in the
admin doc. Then annotated a few of the keywords with some info that was not
in the explanations.

I removed the XP doc from the faq. XP is obsolete and the log_hostname
should be referenced instead. Default is of so unlikely to be a problem.

Also fixed a couple of mispellings in:
  roundup/configuration.py
  roundup/scripts/roundup_server.py

commit: 96dc9f07340a