* dev_guide: highlight Python code snippets
* dev_guide: use monospace for inline source code
* dev_guide: use links for classes and methods
Methods and classes prefixed with :method: and :class: will become
links once we have documentation for the relevant classes and methods.
Thanks to Toshio for pointing that.
* new documentation for unit testing - especially module unit testing
* unit test documentation reformatting and further fixes
* unit test documentation - point to online coverage reports & fix bad spaces
* Small copy edits.
* First pass copy edit / rewrite. More info needed.
* testing documentation - clean up structure, especially code coverage - reduce repetition
* module unit test documentation - improved introduction
* testing documentation - more fixes from and inspired by review from dharmabumstead
* testing documentation - fixes from mattclay + some other minor tweaks
* More copy edits.
* testing documentation - further fixes from review
* Copy edits
* Copy edits
* More copy edits.
