We're going to be using this instead of our internal db.
I also made json_out_obj() take the str arg, as it didn't and I
expected it to.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).