greatly reduce latency and kill some XXXs:

* reduce number of outstanding USB xfers: 6 -> 3
* reduce number of USB frames per xfer: 10 -> 2
* if the device uses wMaxPacketSize frame sizes that are longer than
  1 ms, allow 1 frame per xfer
* instead of making blocksizes big enough to hold all outstanding
  xfers, just make it big enough to hold one xfer
* calculate blocksizes a little better
* be more careful to let the upper layer know exactly when a block
  has been moved in/out of the upper layer buffer

ok ratchov

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