adding unselection handler. The replacement stuff is still not working
correctly though
stuff with the crosshairs/hovering. If i use grid.hoverable = true (as
currently selected) the crosshair is no longer shown though. I should fix this
hovering stuff works :)
- Moved the plotselect/plotunselect/plothover functionality into
  FlotCapabilities. This was needed since plothover needs access to the flot
  `plot' object. Hence it somehow needed to be called in the same js-script
  block as the flot stuff was declared in. Besides, this is nicer[1]

- Fixed the replacement of graphSelected in the indicator. I.e. it only
  replaces the indicator now

- the hovering is partially working now

[1] although the FlotOnHover class is a bit weird now, since it just executes
some Javascript and does not need further interaction with lift.
some changes in the stylesheet regarding the graphSelected stuff
some more styling changes
updated the template so we can edit the title and description again