- run as an unprivileged user by default
- move generated config to /var/run (/tmp/run in fact)
- disable service until it's configured: there is no way to reliably guess
  where files to be shared are located

Signed-off-by: Maxim Storchak <m.storchak@gmail.com>

Some users might create a minidlna root with symlinks
to shared locations. While this could potentially create
a vulnerability, the option should be available to allow
users to do this should they choose to.

wide_links=no : (default) no content served + error message
 [timestamp] upnphttp.c:1366: error: Rejecting wide link X

wide_links=yes : content served, no error messages

Signed-off-by: James Christopher Adduono <jc@adduono.com>