add ids used in add_adis_ids.
add Series class.
implement Series#initialize.
remove Chart#write_series_base because it isn't used.
chart.rb : modify calling write_title_*() statements.
add Chart::Caption class for manage information about title and axis.
Chart#write_title_formula : change parameter ( use object ).
Chart#write_series_name
Chart#write_title_rich : change parameter ( use object ).