Checks first to get key from your .Rprofile or .Renviron (or similar) file
Usage
getkey(x = NULL, service)
Arguments
x
(character) An API key, defaults to NULL
service
(character) The API data provider, used to match to
default guest key (for Tropicos; there's no guest
key for NCBI or IUCN, for which you have to get your own)