[Stackless] Weakref support for tasklets

[Bob Ippolito]

I'm committing weakref support for tasklets, because I have a need for 
it (giving each tasklet a separate stdin/stdout/stderr by using proxy 
objects with __getattr__, since I can not give them separate sys 
modules).  I'm not 100% of the ramifications of this, but it was about 
a four line change and it doesn't seem to cause any problems (though it 
does show how tasklets can be a little odd).

Additionally, would it be useful to put a weakref slot on channels?  I 
don't need that at the moment, but it might be useful to someone?

 >>> import weakref, stackless
[25312 refs]
 >>> t = stackless.tasklet(lambda: None)()
[25336 refs]
 >>> def t_finalize(t): print t
...
[25357 refs]
 >>> t_ref = weakref.ref(t, t_finalize)
[25362 refs]
 >>> del t
[25361 refs]
 >>> stackless.run()
<weakref at 0xce7d0; dead>
[25339 refs]
 >>> t = stackless.tasklet(lambda: None)()
[25360 refs]
 >>> t_ref = weakref.ref(t, t_finalize)
[25361 refs]
 >>> stackless.run()
[25359 refs]
 >>> del t
<weakref at 0xd8158; dead>
[25339 refs]

-bob
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