#==================================================================
# Author    : Djibril Ousmanou
# Copyright : 2010
# Update    : 21/09/2010 16:02:02
# AIM       : Tk::Chart TODO
#==================================================================

Allow to get Q1 and Q3 quartile using one of the nine quantile algorithms in boxplot. 
For the moment, the quantile is calculated with the same algorithm as Excel and type 7 quantile R package. 

Create Tk::Chart::HBars

Add an -cumulate_area option for area graph.
