collection: Update konect URL

src/graph_tool/collection/__init__.py

@@ -37,11 +37,10 @@ This module contains an assortment of useful networks.
 
     Dictionary containing :class:`~graph_tool.Graph` objects, indexed by the
     name of the graph, fetched from the `Koblenz Network Collection
-    <http://konect.uni-koblenz.de/>`_. See the website for a list of available
-    data. The key of the dictionary must correspond to the name of the file
-    minus the ``.tar.bz2`` part.  This is a "lazy" dictionary, i.e. it only
-    downloads the graphs from the web when the items are accessed for the first
-    time.
+    <http://konect.cc/>`_. See the website for a list of available data. The key
+    of the dictionary must correspond to the name of the file minus the
+    ``.tar.bz2`` part.  This is a "lazy" dictionary, i.e. it only downloads the
+    graphs from the web when the items are accessed for the first time.
 
 Examples
 ========

src/graph_tool/collection/konect.py

@@ -93,7 +93,7 @@ def load_koblenz_dir(dirname):
 
 def get_koblenz_network_data(name):
     with tempfile.TemporaryFile(mode='w+b') as ftemp:
-        response = urlopen('http://konect.uni-koblenz.de/downloads/tsv/%s.tar.bz2' % name)
+        response = urlopen('http://konect.cc/files/download.tsv.%s.tar.bz2' % name)
         buflen = 1 << 20
         while True:
             buf = response.read(buflen)