Download links
Fixes #311 (closed)
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Added unit test to report invalid formats in download links.
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Fixed formatting for download links.
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Also fixes bug in service worker config, which is likely responsible for basemap tile requests. (relates to but does not completely fix #312 (closed) ) Basemap tiles were included with earthquake data, which uses a "freshness" cache strategy. This has the unintended effect of always making a network request to check for a new version instead of using the browser cache.