BoxBox - A box region with sides parallel to the axes of a Frame

Description:
The Box class implements a RegionRegion which represents a box with sides parallel to the axes of a FrameFrame (i.e. an area which encloses a given range of values on each axis). A Box is similar to an IntervalInterval, the only real difference being that the Interval class allows some axis limits to be unspecified. Note, a Box will only look like a box if the Frame geometry is approximately flat. For instance, a Box centred close to a pole in a SkyFrameSkyFrame will look more like a fan than a box (the PolygonPolygon class can be used to create a box-like region close to a pole).
Constructor Function:
astBoxastBox
Inheritance
The Box class inherits from the Region class.
Attributes
The Box class does not define any new attributes beyond those which are applicable to all Regions.
Functions
The Box class does not define any new functions beyond those which are applicable to all Regions.