Depending on the argument, the delete_histogram command deletes
the current histogram, the histogram indicated in a ChipsId
structure or by the histogram_id, or all histograms.
(no argument) - the current histogram is deleted.
ChipsId - an optional ChipsId structure containing
values to modify the currency state for the command.
histogram_id - identification tag given to each object that
is created; use this to delete a specific histogram.
Two histograms are created; the second histogram is
current after it is created. The id.histogram command sets
the histogram value of the ChipsId structure to the
first histogram. That histogram is then deleted.