UnflaggedOptions are values whose meanings
are indicated by their position on the command line relative to other
UnflaggedOptions (see example in Chapter 2).
on the command line in the order in which they were registered with the
UnflaggedOptions (set via
UnflaggedOption.setGreedy(boolean)) consume all
remaining unflagged values from the command line as multiple values.
JSAP can have only one greedy
UnflaggedOption, and it must be the last
UnflaggedOption registered with the