TODO revision 1.6 
1Some things that need to be done in no particular order:
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3Implement isochronous transfer mode.
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5Implement audio driver.
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7Do bandwidth accounting.
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9Use lock manager locks.
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11Use the pool allocator for TDs et al.
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13Merge soft_td and td in uhci.c.
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15Redo toggle handling in UHCI driver.
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17Tidy up transfer completion.
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19Throw out more USBDI gunk.
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