Initial webrev with changes for JDK 9

[Alan Bateman]

I've refreshed the webrevs here:
    http://cr.openjdk.java.net/~alanb/8142968/2

so that we have a snapshot of what is currently in the jigsaw/jake 
forest. The webrevs are against jdk-9+109.

As I said in the last mail, we would like to integrate this snapshot 
into JDK 9 before the end of March. The proposal is to aim to integrate 
during the week of March 21, with the the week of March 28 as fallback 
in event of problems.

The related JEPs (JEP 200, JEP 260, JEP 261 and JEP 282) are now in 
"Proposed to Target" state. Mark send mail to jdk9-dev with this list 
and other proposals yesterday.

-Alan