Currently we can only build docs using setup.py, but its currently the only task that we absolutely need setup.py for (everything else is WAF). Add a wscript_build to our docs directory and appropriate code in wscript/etc to build our docs as an automatic second step after normal building is done.

On the surface this is a 4-5 line task, however, our current use of ./setup.py build_docs does not rebuild docs which have changed but instead requires that we remove docs/build to force an update. This problem may be just setup.py distutils stupidity which Waf will clean up automatically (the Waf tool should be building docs in build/docs anyway) or it may be an issue with Sphinx that needs deeper inspection.

If the problem is deeper, identify it and at least write a quick hack to address it (eg, always rebuild all docs regardless to whether any have changed) though a more elegant solution is obviously preferred.

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When you've done, commit your work and post the resulting changeset url to this task.