Pretty large development merge. Including:
- More robust PHP error handling.
- Automatically update release data from various sources. Manually
updating a json file was too error prone.
- Normalize hashes of release notes, so that they won't need to be
manually updated so often.
- Small improvements to quickbook page data.
- Cache html generated from quickbook - so no need to reparse when
changing release data. Much of the site can now be rebuilt without
installing quickbook, although changes in quickbook won't be included.
- Scripts in site-tools have are more consistent at the command line,
and all support '--help' (although some have very little information).
- Automatically update more of the site for new releases.
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