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These functions are for the initialization of the presentation graphics
system and the displaying of charts.  The  _pg_initchart function
initializes the system and should be the first presentation graphics
function called.  The single-series functions display a single set of data
on a chart; the multi-series functions (those ending with ms) display
several sets of data on the same chart.

The following functions are defined:

_pg_chart
    display a bar, column or line chart

_pg_chartms
    display a multi-series bar, column or line chart

_pg_chartpie
    display a pie chart

_pg_chartscatter
    display a scatter chart

_pg_chartscatterms
    display a multi-series scatter chart

_pg_defaultchart
    initialize the chart environment for a specific chart type

_pg_initchart
    initialize the presentation graphics system