Update to address recurring R-CMD-Check failures #44
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The recurring failures of R-CMD-Check were due to hitting a universal bandwidth limit on the API. I've implemented a local-disk caching system and a new throttling option to enforce a wait time between function calls. If the problem persists, fixing it should be a simple matter of setting the option to a higher wait time during tests. But I've done several runs, and so far it looks good.
Use of a cache saves on bandwidth, but it didn't particularly improve runtime—at least not with my high-speed Internet. Caching is turned on by default, but I've made it togglable with an option, so the default can always be changed in a future patch if it turns out to be more trouble than it's worth.