This function checks for a "pvs.key" option. If the option exists, its
stored value is presumed to be the API key. If the option doesn't exist,
the function checks the global environment for a
and uses it as the API key. The function returns the key as a character
John Bullock <email@example.com>
## Not run: options("pvs.key" = "yourkey") ## Not run: pvs.key <- "yourkey"
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