TBQueue is part of stm since 2.4.

(And this in turn is part of the current platform.)
Add comments explaining how to invoke the program.
Add TBQUEUE as fourth choice in comment.
Prevent name clashes with STM lib.
merge kosmikus/stm
Merge branch 'master' of github.com:simonmar/parconc-examples

* 'master' of github.com:simonmar/parconc-examples:
  Remove redundant import.
  Remove redundant imports.
  waitAny should be exported from Async.
  Remove redundant imports.
  Remove redundant imports.