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* ColorScale: now a pointer whenever needed. main() takes care of
updating extents
* New class DivergentColorScale: works specifically for divergent
scales, always has 3 colors as input: negative values, 0, positive
values
* ManipulationHandler: ProjectionHistory no longer needed
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ProjectionObserver class has been removed, all of its functionality
is now inside class ProjectionHistory, thus dealing with the design
problem mentioned in the previous commit. ProjectionHistory is now
also responsible for all rewinding functionality, which makes more
sense.
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* Main class is now responsible for updating map components
whenever the current map changes (even rewinding): this simplifies
other objects because they don't have to know anything about how
the data is being displayed later (no CP/RP juggling everywhere)
* Added undo/reset actions to main view, including menu items
* ProjectionHistory now has specific signals for each change
happening to the history
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