Getting rid of async.h

[Eric Pouech]

The main goal of this patch is to remove include/async.h

Basically, the asynchronous operations's implementation is changed in the 
following way:
- async op:s are no longer automatically requeued in the server, it's up to the 
client to do it (it simplifies the interface, and removes some races conditions)
- for each async op queued in the server, the callback will be called only once. 
The callback signature has changed to match PIO_APC_ROUTINE, which is closer to 
NT behavior.
- this requires separating (in two different lumps of memory) the 
IO_STATUS_BLOCK and the called specific information. We also pass the two lumps 
to the server, and in the I/O APC for callback
- cancelling an IO has been entirely moved to the server (through a new server 
request)
- we maintain on the client side whether there's still some pending async op on 
the current thread (this is needed in optimizing some wait operations)
- server/async.[ch] have been removed (there wasn't much left in them)
- on server side, the queue structure has been removed and replaced by a simple 
linked list

A+
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