Added manage.py command to refresh (almost) expired links.

manage.py refresh_project_links  5672beecc0261b2005ed1a33 -c 4

This refreshes the oldest 4 links of that project.

pillar/manage.py

@@ -643,5 +643,15 @@ def subscribe_node_owners():
             after_inserting_nodes([n])
 
 
+@manager.command
+def refresh_project_links(project, chunk_size=50):
+    """Regenerates almost-expired file links for a certain project."""
+
+    chunk_size = int(chunk_size)  # CLI parameters are passed as strings
+
+    from application.modules import file_storage
+    file_storage.refresh_links_for_project(project, chunk_size, 2 * 3600)
+
+
 if __name__ == '__main__':
     manager.run()