fillInUI ( self,  parent )
 
intended layout:                        for multi-residue sequence lay out a label
                        widget naming the chain (blank ID == "Principal
                        Chain") and a text widget with that sequence.
                        See gnats comments by Tom Goddard.  Should be
                        a status area so that the residue ID under the
                        cursor can be reported in realtime.
                        Also, a check button for connecting/disconnecting
                        to graphics selection (default on).
                        Put a status widget next to each chain label.
                        If more than 5 chains, layout in multiple 
                        columns?  Put the whole shebang (except status
                        area) in a scrolled frame. 
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