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<p>
Classes for formatting a Datum to a String. The DatumFormatter
base class identifies four methods: format(Datum), format( Datum, Units ),
grannyFormat( Datum ), and grannyFormat( Datum, Units ). format(Datum)
should return a string accurately representing the datum out-of-context,
generally meaning the datum's units are displayed along with the double
value. format(Datum,Units) means that the string will be used in the context
of the given units. For example, say you want to output an ascii table
with column headers. Each column header indicates a title and a unit, for
example, "delay(sec)." Then to format a datum for displaying in this column
format( datum, Units.seconds ) would return an appropriate number. The
grannyFormat methods work the same way, except the formatter may return
a "granny string" (see GrannyTextRenderer) like "cm!e-3!n"
<p>format(Datum) is the
only abstract class, and by default all other methods simply return the result
of the format(Datum) method.</p>
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