Some substantial other related changes:
* Switched DataExplorer view to have element it attaches to passed in rather than being created internally (this was important for FlotGraph to set up correctly).
* Also refactored DataExplorer setup somewhat (e.g. got rid of draw function which wasn't needed -- merging necessary parts with initialize)
* Substantial refactoring of FlotGraph so that we correctly work around flot's delicateness regarding rendering (element must not be hidden etc -- see comments in code)
* Also generally cleaner code
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