Adding point sensitivity analysis to radviz.

changing the destroy R process function in Rservice from private to
public so that it can be called from a client...
Merge branch 'master' into fkamayou
workaround for voronoi bug
added option to probe for annuli
working on the annuli
computed inner and outer radius...
temp push
partially complete, still need to computer the center of annulus
merge with master:
Merge branch 'master' of https://github.com/IVPR/Weave into fkamayou
replacing the selector for the column names with a check box list
Added a plot for the annulus center
Adding option for drawing the convex hull of DAs
Sorting the anchors before drawing the convex hull
fixed in compare function returning a boolean rather than a Number