kawa binary snapshot

[Per Bothner <per@bothner.com>]

I'm switching to a new "more complete" style of binary releases for Kawa.
Please check out:
     ftp://ftp.gnu.org/pub/gnu/kawa/kawa-2.1.9-20160605.zip

Later, we could perhaps set up automatically-generated binary snapshots.

This bundles not only the kawa .jar file, but also a shell script
(bin/kawa) or Windows batch file (bin/kawa.bat), along with version 3
of the jline input library.  This should be fairly portable.
The jline input editing doesn't seem to work on Windows (I need to
research how to fix this), but it works fine on Fedora and probably
most GNU/Linux distributions. Reports on how it works on *BSD and MacOS
would be helpful.

Using jline3 has a number of advantages:  In contrast to GNU readline,
it doesn't require compiling a C program, which makes it easier to
distribute binaries.  It supports command completion.   (Well, so does GNU
readline, but it's more complicated to write, especially if we want to
avoid subjecting Kawa to the GPL.)

The multi-line input editing is neat: While writing a continuation line,
you can go back and edit an earlier line in the multi-line command.
A continuation line is when you hit enter when more input is required
(such as inside parenthesis), or if you explicitly type Esc Enter or Ctrl-Q Ctrl-J.
Multi-line commands are stored as a single entry in the history.

More REPL improvements are planned.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/