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We make it a first-class citizen internally, even though we won't use it over the wire (at least, non-experimental builds). This scheme follows the latest draft, in which features are flagged compulsory. We also add several helper functions. Since uses the *even* bits (as per latest spec), not the *odd* bits, we have some other fixups. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>