PLOT <name of data>
plots a bar chart of a data set on disk or defined by a DATA
specification.
The first active field of the data set will be assumed a string field
and it is used as the label for each bar/pie.
If the label field is not the first one, it can be indicated by a 'L' mask.
All other active fields will be plotted.
If the label field is not a string field, no labels are used and all
active fields are plotted.
T = types of bar/pie charts
X = Extra specifications
P = More information on plotting
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