hiawatha: bump to version 8.2 and define saner default directories

Bump to version 8.2.
Define CONFIG_DIR=/etc/hiawatha, LOG_DIR=/var/log, PID_DIR=/var/run and
WEBROOT_DIR=/var/www/hiawatha which are the same as the defaults but
without the /usr prefix.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>