code: public AnyDelete addColumn(String family, String qualifier) {
          delete.addColumn(toFamilyQualifierBytes(family), toFamilyQualifierBytes(qualifier));
  
          return this;
      }
docs: Delete the latest version of the specified column.
  This is an expensive call in that on the server-side, it first does a
  get to find the latest versions timestamp.  Then it adds a delete using
  the fetched cells timestamp.
  
  @param family
  @param qualifier
  @return