Implemented auto-scrolling historical imagery view in ImageryController. Imagery domain objects now request historical data on each manual bounds change. Added new specs for ensuring that historical data is requested on bounds change and duplicate bounds / datum are ignored.
mct-scroll-x is an attribute whose value is an assignable
Angular expression. This two-way binds that expression to the
horizontal scroll state of the element on which it is applied.
mct-scroll-y is an attribute whose value is an assignable
Angular expression. This two-way binds that expression to the
vertical scroll state of the element on which it is applied.
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