This will set the correct `direction` on manual route hops (in/out).
Before this was not set, resulting in WIRE_FEE_INSUFFICIENT errors,
if fee was calcualted inconsistently with `direction`.
* doc: cleanup and key-value for optional parameters
* rebalance: cleanup and refinements
* sendinvoiceless: cleanup and refinements
* summary: reflects upcoming changes of pylightning to_approx_str
* rebalance: check peer connection on local channels
The channel selection query didnt filter for channels not
having a short_channel_id yet (unconfirmed ones).
This lead to a KeyError whenever an unconfirmed channel existed.
