Fixes positioning of the legend in View and Print modes.

This patch makes a better assumption of the location for the
legend in both View and Print modes. It also fixes a few oddities
that we used to have ( like hardcoded spacing ).

We are taking the scene().sceneRect() now into consideration to
better place it on canvas.

Fixes: #322

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Different Icon for a Bookmark Event.

This patch adds a different icon for a Bookmark Event, and it
also cleaned a lot of code. :)

See #300

[Dirk Hohndel: made the two icons slightly bigger]

Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>