Make the Axis set the changed flag when a new line is set

This was preventing the recalculation of the ticks, making the
line static when we enabled or disabled the PP graphs.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Fix a link on ES user manual

Compile of the user manual failed on XML validation due to typo on the
link.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Image declaration to one line on ES manual

It appears that new lines are not allowed on image declarations on user
manual.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Add test dive with heart rate information

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Do not show the heartrate info unconditionally.

use the preferences instead.

Fixes #664

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>