DOC: ipython_config.py: docstrings
ENH,BUG: ipython_config.py: less -r -> less -R (man less)
BLD: Makefile: sphinx-apidoc (add -f, remove --no-headings)
DOC: docstrings, __ALL__ imports (for tab-completion)
DOC: dotfiles.* sphinx-apidoc headings
DOC: index.rst: toc maxdepth 3 -> 4
DOC: tools.rst