Scala is not distributed with the rscala package.  Individuals can install
Scala using "rscala::scalaInstall()" which places Scala in "~/.rscala" in the
user's home directory.  System administrators should install Scala globally as
described here: http://www.scala-lang.org/download/install.html.  In short,
simply download the archive, unpack it, and add the "scala" script to the path.
Note that Scala itself requires Java.  The rscala package tries various
techniques to find a suitable Scala installation, including searching the path.
Details on the search are available using "rscala::scalaInfo(verbose=TRUE)".
