Unresovled BlackBox issues

[chick]

• There is no way for a developer to know what parameterized changes took place between chisel and firrtl
• The IO's may have be different, treadle can pass in seq of io information on size, dir and type
• internal changes could only be forwarded via some kind of annotation, analysis needed here
• The getOutput method should be changed to eliminate the input fields
  • That information should now be handled exclusively vi the input change handing method
• Black boxes should be allowed to allocated storage in the datastore
  • This would allow snapshotting to capture black box state
• Black boxes should be allowed to interact with vcd log (when present)
• There should be some mechanism for deep internal access to treadle engine
  • vcd access might be built on top of this.