[Rd] internal string comparison (Scollate)

[Romain François]

Hello, 

I’d like to compare two strings internally the way R would, so I need Scollate which is not part of the authorized R api. 

So: 
 - Can Scollate (and perhaps Seql) be promoted to api ?
 - If not what are the alternatives ? Using strcmp or stroll does not seem as general as Scollate. 

Romain

PS: Here is some context: https://github.com/hadley/dplyr/issues/325