Use the first available highlighted curve as basis for display of horizontal readout value. Fallback to single realization curves.
When selecting a realization in project tree, highlight all related curves
Make sure zoom rect works when readout annotations are active
* Make sure ensemble curveset legends are shown in multiplot legend.
* Remove information already shown in title from curve legend.
* Fix missing legend when creating curve plot from ensemble curves
* Show actual curve color in legend