Apply patches provided by ryoon@ with some modifications to upgrade to
Scala 2.9.1 from 2.8.1. PR pkg/45379

Scala 2.9.0 final

The Scala 2.9.0 codebase includes several additions, notably the new
Parallel Collections, but it also introduces improvements on many
existing features, and contains many bug fixes:

  * Parallel Collections
  * The App Trait
  * The DelayedInit Trait
  * Repl Improvements
  * Scala Runner
  * Java Interop
  * Generalized try-catch-finally
  * New packages: scala.sys and scala.sys.process, which are imported
    from sbt.Process.
  * New methods in collections: collectFirst, maxBy, minBy, span, inits,
    tails, permutations, combinations, subsets
  * AnyRef specialization:

See http://www.scala-lang.org/node/9483 for more details.

Scala 2.9.1 final

The 2.9.1 release of Scala includes many bug fixes and improvements,
in particular to the interpreter: most of the interpreter changes
available in the development mainline have been ported to the 2.9.x
release branch.

See http://www.scala-lang.org/node/10780 for more details.

Note: the interpreter option '-i' may behave incorrectly in this
version. In case you require it, please just add the option
'-Yrepl-sync' to your command line as well.

(yyamano)