Fetch more developer tools.

buildout.cfg

 [buildout]
 develop = .
 parts =
+  pyflakes
   slapos.toolbox
 
 # SlapOS patched buildout
@@ -8,9 +9,21 @@ find-links = http://www.nexedi.org/static/packages/source/slapos.buildout/
 
 versions = versions
 
+[pyflakes]
+recipe = zc.recipe.egg
+scripts =
+  pyflakes
+eggs =
+  pyflakes
+  setuptools
+
 [slapos.toolbox]
 recipe = z3c.recipe.scripts
 eggs =
+  ipython
+  ipdb
+  pep8
+  rstctl
   slapos.toolbox
 interpreter = python