Wording improvements and fixes

formatting; grammar

Headers reference Creative Commons

minor Executors doc tweaks

Documentation improvments; support two-arg submit

Replace PrivilegedFutureTask with Executors.privilegedCallable

Documentation improvements

Remove internal delegation wrappers

Raw List returned by shutdownNow is really List<Runnable>.

Oops, forgot to remove <V> Future<V> execute(Executor, Runnable, V),
which we don't need now that we have Future<?> execute(Executor, Runnable).

ScheduledExecutorService for Executors factory method return type

Removed one of the newScheduledThreadPool factory methods

Revised tests for revised Future classes

Clarified PFT documentation

Remove explicit CCL/ACC constructors and class methods

Proofreading pass -- many minor adjustments

Removed non-standard tags and misc javadoc cleanup

Future extends Cancellable.
class SE.DelayedTask -> interface ScheduledCancellable
class SE.DelayedFutureTask -> interface ScheduledFuture
Add primitive SE test.
Related internals changes.

Fix broken doc links

Changed modifier order for DelegatedExecutorService to private static class

Changed ExecutionException to RejectedExecutionException in invoke methods.

Fixed doc comments to refer to ExecutionException
rather than CannotExecuteException.

Minor documentation updates
Remove remove(task) from ExecutorService, Add removablity to ScheduledExecutor tasks, Revert Executors.execute to return FutureTask

Please the new generics compiler

Moved main source rooted at . to ./src/main
Moved test source rooted at ./etc/testcases to ./src/test