[R] Sorting of character vectors

[Pascal A. Niklaus]

Thanks for all suggestions.

With my build (from the CRAN repo) I don't get ICU support, and setting 
LC_COLLATE to "C" did not help.

 > capabilities("ICU")
   ICU
FALSE

 > sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 14.04.5 LTS

locale:
  [1] LC_CTYPE=en_DK.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=en_DK.UTF-8        LC_COLLATE=C
  [5] LC_MONETARY=en_DK.UTF-8    LC_MESSAGES=en_DK.UTF-8
  [7] LC_PAPER=en_DK.UTF-8       LC_NAME=C
  [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_DK.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] compiler_3.3.2 tools_3.3.2



However, using stringi::stri_sort did the trick !