avro/Cytoband and core/Cytoband - do we need both?

[julie-sullivan]

// avro
   private java.lang.String chromosome;
   private java.lang.String stain;
   private java.lang.String name;
   private java.lang.Integer start;
   private java.lang.Integer end;

// core
	private String name;
	private String stain;
	private int start;
	private int end;

REST and the variant calculator use the avro one, and the chromosome collection seems to use the one from core.

[julie-sullivan]

variantannotation is in avro, needs to be in avro and needs a cytoband.

So we should delete the core cytoband as a duplicate, and keep the avro one.