Tutorial update for 3.0 by Paul Dubois.

I had to fix a few markup issues in controlflow.rst and modules.rst.

There's a unicode issue on line 448 in introduction.rst that someone else needs to fix.
diff --git a/Doc/tutorial/whatnow.rst b/Doc/tutorial/whatnow.rst
index 599fcbd..69fa9c3 100644
--- a/Doc/tutorial/whatnow.rst
+++ b/Doc/tutorial/whatnow.rst
@@ -48,6 +48,11 @@
   Particularly notable contributions are collected in a book also titled Python
   Cookbook (O'Reilly & Associates, ISBN 0-596-00797-3.)
 
+* http://scipy.org: The Scientific Python project includes modules for fast
+  array computations and manipulations plus a host of packages for such 
+  things as linear algebra, Fourier transforms, non-linear solvers, 
+  random number distributions, statistical analysis and the like.
+
 For Python-related questions and problem reports, you can post to the newsgroup
 :newsgroup:`comp.lang.python`, or send them to the mailing list at
 python-list@python.org.  The newsgroup and mailing list are gatewayed, so