Document the setpower command

Signed-off-by: Michal Čihař <michal@cihar.com>
Po files update

Signed-off-by: Michal Čihař <michal@cihar.com>
Update man pages

Signed-off-by: Michal Čihař <michal@cihar.com>
Update doxygen configrations

Signed-off-by: Michal Čihař <michal@cihar.com>
Adjust year

Signed-off-by: Michal Čihař <michal@cihar.com>