To allow for a single to configure global settings for userhelper an include
directive is needed in the configuration parsing.

This allows easy configuration for following scenarios;
1. always ask for root passwd
USER=root
2. ask for user passwd if user is in group wheel, else ask root passwd
USER=root
UGROUPS=wheel
3. ask for user passwd if user is in group wheel, else disallow
USER=<none>
UGROUPS=wheel

By creating a single file with one the above settings and including that file in
each other config the system can easily be reconfigured.

A file can be included by using '.'. For example:
# cat /etc/security/console.apps/pup
. default
PROGRAM=/usr/sbin/pup
SESSION=true
KEEP_ENV_VARS=http_proxy,ftp_proxy

(patch does not include translations)