| download.new.file | R Documentation | 
Uses 'curl -z' to check that the online file has been updated more recently than the timestamp on the destination file
download.new.file(url, fn)
url | 
 the file to be downloaded  | 
fn | 
 the filename where it will go. Won't download unless the online file has been updated more recently than this file has been modified.  | 
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