st: Updated Venndiag.ado for Stata8-10

[Jens Lauritsen <jl@epidata.dk>]

Kingsley requested  to draw venn diagram (circle) in stata 9 but no 
graph came

The problem is that the version of venndiag.ado which works with Stata9 
(+ 10) was only available from me directly.
I have uploaded a copy which you can get by:  net describe venndiag, 
from(http://www.bola.suite.dk)

Should work in Stata 9 and 10.

By the way, quite interesting that the Venn diagrams stems from logic 
published by Venn around 1850.

I should get the updated version sent to the archives and Stata J.

Regards
Jens Lauritsen
Odense, Denmark, Author of Venndiag routine
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