https://bugs.python.org/issue23722

Thanks Nick Coghlan for advice and review.

Cells in the first column must contain some text.
http://docutils.sourceforge.net/docs/dev/rst/problems.html#tables

PROJ.4 4.7.0 was released on 25 Sep 2009 and is available in Ubuntu 12.04.

Removed DatabaseFeatures.supports_bitwise_or feature (unused, always True).

Thanks Tim Graham for the review.

The refactor in 3f76d140 fixed the creation
of redundant indexes.

Forwardport of 82ce55db from stable/1.10.x

Thanks Pete Flugstad for the report, and Tim Graham for the review.

Major thanks to Shai for helping to refactor the tests, and to
Shai, Tim, Florian, and others for extensive and helpful review.

Thanks Frank Bijlsma for the initial patch.