protocol: small cleanup in packet registration
I made a mistake in commit 13a64cfe ("Simplify definition of packets by computing automatically their codes"). My intention was that the code an answer packet continues to only differ by the highest bit, as implemented now by this commit. Before: 0x0001, 0x8002 Ask1, Answer1 0x0003 Notify2 0x0004, 0x8005 Ask3, Answer3 0x0006, 0x8007 Ask4, Answer4 After: 0x0001, 0x8001 Ask1, Answer1 0x0002 Notify2 0x0003, 0x8003 Ask3, Answer3 0x0004, 0x8004 Ask4, Answer4 This makes the protocol easier to document. And by not wasting the range of possible values, it seems we have enough space to shrink to a single byte. This also removes code that became meaningless since that codes are generated automatically.
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