CHANGES IN VERSION 0.2.2

* overlapPlot gains argument ylim (wish of Jesse Lewis)

* densityPlot gains arguments ylim, xlab, ylab (wish of Wenhong Xiao)

CHANGES IN VERSION 0.2.0

* Fixed bug in overlapPlot (reported by Jesse Lewis) and added overlapPlot to
  examples on 'kerinchi' help page.
  
* overlapPlot gains arguments linewidth, xlab and ylab.

