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if left unset, will return the user data dir as returned by `tools::R_user_dir` for this package.
nhdplusTools_data_dir(dir = NULL)
character path of data directory (silent when setting)
path of desired data directory
nhdplusTools_data_dir() nhdplusTools_data_dir("demo") nhdplusTools_data_dir(tools::R_user_dir("nhdplusTools"))
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