Fix JS search when html_copy_source is off.
Fix #60: "smart" image inclusion in subdirs.
Fix #68: invalid latex output for images with height set.
Fix automethod outside class context.
#65: Store depth information in PNG images themselves.
Fix #70: clarify meaning of |today|.
Fix handling of :param: and :type: with roles.
Warn if doctest blocks don't contain code.
Fix two issues with non-ASCII characters being written to byte streams.
* #72: In pngmath, make it possible to give a full path to LaTeX and
  dvipng on Windows.  For that to work, the ``pngmath_latex`` and
  ``pngmath_dvipng`` options are no longer split into command and
  additional arguments; use ``pngmath_latex_args`` and
  ``pngmath_dvipng_args`` to give additional arguments.
Remove duplicate warning.
Fix #67: Output warnings about failed doctests in the doctest extension
even when running in quiet mode.
Prepare for 0.5.1 release.
Added tag 0.5.1 for changeset dfe5aae7c8ad
Post-release updates.
Add SQLAlchemy.
Fix #58: Add extension tutorial and better docs on where to put extensions.
Note how to change default role.
Fix #80: use string.ascii_* constants in case locale.setlocale() is
somehow called which then leads to UnicodeErrors.
* #81: Write environment and search index in a manner that is safe
  from exceptions that occur during dumping.