Rename package

[JBGruber]

Since there was at some point a package called ATR on CRAN, the name is blocked and we can't submit the package under this name. We thus decided to rename the package to atrrr. You can easily move your old tokens to work in the new package with:

R.utils::copyDirectory(tools::R_user_dir("atr", "cache"), 
                       tools::R_user_dir("atrrr", "cache"))

Nothing else changes, except that you have to change library(atr) and atr:: call to the new atrrr.