Support tile-less IIIF as per LegacyTileSource: Fix #737 #816
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I did experiment with a version that removed any duplication of code from LegacyTileSource - but that made IIIFTileSource depend on the existence and implementation of LegacyTileSource, which seemed less preferable than a dozen or so lines of borrowed logic. This PR has no dependency on LegacyTileSource.
The same legacy image pyramid can be used as a test and demo for LegacyTileSource, so I have added two new tests to formats.js.
The leaves image was created by my partner and my daughter; there are no rights issues.