This touches a lot of text, mainly to change "if `option_anchor_outputs`"
to "if `option_anchors`"
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
`test_opening_tiny_channel` fails if EXPERIMENTAL_FEATURES is on because
we don't include the anchor in our reserve if we're the channel opener.
Seems fine to include in all cases?