RFR: JDK-8203827: Upgrade JLine to 2.14.6

[Jan Lahoda]

Hi,

I'd like to upgrade the JLine used by JShell and jjs from 2.12.1 to 2.14.6.

The complete webrev is here:
http://cr.openjdk.java.net/~jlahoda/8203827/webrev.00/complete/

To simplify reviewing, there is:
-an antipatch that removes the JDK-specific changes and restores the 
vanilla 2.12.1 content:
http://cr.openjdk.java.net/~jlahoda/8203827/webrev.00/undo-jdk-extras/
-a patch that replaces the 2.12.1 content with 2.14.6:
http://cr.openjdk.java.net/~jlahoda/8203827/webrev.00/upgrade-jline/
-a patch that re-applies the JDK-specific changes (like including 
adjusting packages, and removal/commenting out of usage of features that 
would require undesirable dependencies, and any changes that had to be 
done to other modules):
http://cr.openjdk.java.net/~jlahoda/8203827/webrev.00/adding-jdk-extras/

JBS entry: https://bugs.openjdk.java.net/browse/JDK-8203827

How does this look?

Thanks,
     Jan