[1.8.x] Fixed possible "RuntimeError: maximum recursion depth exceeded" building docs.

import sys

from os.path import abspath, dirname, join

# Workaround for sphinx-build recursion limit overflow:

# pickle.dump(doctree, f, pickle.HIGHEST_PROTOCOL)

#  RuntimeError: maximum recursion depth exceeded while pickling an object

#

# Python's default allowed recursion depth is 1000 but this isn't enough for

# building docs/ref/settings.txt sometimes.

# https://groups.google.com/d/topic/sphinx-dev/MtRf64eGtv4/discussion

sys.setrecursionlimit(2000)

# Make sure we get the version of this copy of Django

sys.path.insert(1, dirname(dirname(abspath(__file__))))