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This file is an attempt to catalog various implementation details as well
as points where the implementation does not yet meet the design.



- The making of panes does not conform to the design.  Currently, the panes
are made at view realization rather than creation.  It is not yet clear to
me how to fix this problem satisfactorily.

- The view/object protocol is unimplemented.

- The notion of <shape> is a little rough.  Right now, it's just defined
with rectanguler slots.  This needs to be updated to use a subclass
(<rect-shape>), and thus allow for other kinds of shapes.

- Missing the ability to set event masks as designed.

- Context facility not yet constructed.

- No view classes defined beyond the very basic ones.

- No drawing primitives.

- No resource management.

- We might want some kind of generic region datatype.

- Need to specify dialog system.
- Need to specify menu system.

- Need to better develop the notion of contexts.