ForkJoin updates

New versions of internals for ForkJoin{Task, Pool, WorkerThread} are
now available in jsr166y as well and proto-java.util.concurrent.
You can run these (on Java 6 or jdk7 builds) by using new jars.
You'll probably see some performance improvement. Please let
me know if otherwise. After giving them some time to settle,
we will update the openjdk7 versions.
Here are the usual links:

jsr166y:
* API specs:  http://gee.cs.oswego.edu/dl/jsr166/dist/jsr166ydocs/
* jar file: http://gee.cs.oswego.edu/dl/jsr166/dist/jsr166y.jar (compiled using
Java6 javac).
* Browsable CVS sources:
http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166y/

openjdk7-ready java.util.concurrent:
* API specs:  http://gee.cs.oswego.edu/dl/jsr166/dist/docs/
* jar file: http://gee.cs.oswego.edu/dl/jsr166/dist/jsr166.jar
* Browsable CVS sources:
http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/main/java/util/

-Doug