Integer type policy

Integers are for numbers, enabling arithmetic like subtractions and for
loops without getting shot in the foot. Unsigneds are for bitfields.

- "int" for numbers that will always be laughably smaller than four
  billion, and where we don't care about the serialization format.

- "int32" for numbers that will always be laughably smaller than four
  billion, and will be serialized to four bytes.

- "int64" for numbers that may approach four billion or will be
  serialized to eight bytes.

- "uint32" and "uint64" for bitfields, depending on required number of
  bits and serialization format. Likewise "uint8" and "uint16", although
  rare in this project since they don't exist in XDR.

- "int8", "int16" and plain "uint" are almost never useful.

build.go

@@ -301,7 +301,7 @@ func assets() {
 }
 
 func xdr() {
-	runPrint("go", "generate", "./internal/discover", "./internal/db", "./internal/protocol")
+	runPrint("go", "generate", "./internal/discover", "./internal/db")
 }
 
 func translate() {