Description: install doc in the right place for Debian

Index: python-networkx-1.6/setup.py
===================================================================
--- python-networkx-1.6.orig/setup.py	2011-11-19 02:31:31.000000000 +0100
+++ python-networkx-1.6/setup.py	2011-12-26 13:01:41.133595008 +0100
@@ -53,7 +53,7 @@
           "networkx.tests",
           "networkx.utils"]
 
-docdirbase  = 'share/doc/networkx-%s' % version
+docdirbase  = 'share/doc/python-networkx'
 # add basic documentation 
 data = [(docdirbase, glob("*.txt"))]
 # add examples
