Useful for regtest and testnet. Sure, you shouldn't use this on mainnet,
but I haven't restricted it because our users are usually pretty clever.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Fixes: #1806
Changelog-Added: config: `force_feerates` option to allow overriding feerate estimates (mainly for regtest).
Some additional detail was warranted in several places, though the
listconfigs is better off simply referring to lightningd-config.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Fixed: doc: Many missing manual pages were completed
