The shutdown hook installed by jline has made l...

The shutdown hook installed by jline has made life difficult for sbt
for a while. This changes jline not to install it, and alters the scala
startup script to trap exit and re-enable echo on recognizably unix
platforms. In addition it no longer installs a shutdown hook to flush
the repl history to disk, instead flushing after every line.

Any bash reviewers out there? Unless someone raises a hand, no review.

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