changed to new octal literal format (in 3 modules)

2 modules were changed by the 2to3 tool.
The other required change was found in a doc-test.

13 further modules were checked to find, that the suspicious strings were
either in output or in comments.
Build documentation for a single Python file
Merge branch 'u/jhpalmieri/sphinx-single-file' of git://trac.sagemath.org/sage into develop
Sphinx single-file: more documentation, option to save output elsewhere
Add a sage -ipynb option
IPython notebook with Sage extensions
Merge #16746 (Improvements to the Sage displayhook)
Make zeromq and pyzmq standard packages
Add 2d graphics to the ipython notebook
Extend IPython notebook templates
Merge remote-tracking branch 'origin/develop' into ticket/15015
Upgrade to mpir-2.7.0-alpha12
Fix doctests due to changed xgcd results
Re-enable "not tested" test from #4357
Consolidate notebook launchers and use argparse
Fix initialization of matrices and fix _hnf_mod()
Switch ipy -> ipython everywhere
Split the SageInteractiveShell into terminal and notebook versions
Remove left-over attempt at doctests
Mention the default notebook in the help