with a different effective group. If the -g option is specified
without -u the command will be run as the current user (only the
group will change). the -g and -u options may be used together.
TODO: implement runas group for ldap
improve runas group documentation
add testsudoers support
and word-wrapped output. Currently used for sudo's usage() and
sudo -l output. Sudo usage strings are now in sudo_usage.h which
is generated at configure time.