def initialize(drawing, options={})
      @drawing = drawing
      @width = 0
      @height = 0
      drawing.anchors << self
      @from = Marker.new
      parse_options options
      start_at(*options[:start_at]) if options[:start_at]
      @object = Pic.new(self, options)
    end
Creates a new OneCellAnchor object and an Pic associated with it.
@param [Drawing] drawing
@option options [Array] start_at the col, row to start at
@option options [Integer] width
@option options [Integer] height
@option options [String] image_src the file location of the image you will render
@option options [String] name the name attribute for the rendered image
@option options [String] descr the description of the image rendered