Feature Request: rebalance by alias input (balanceofsatoshis style)

[ErhardDu]

Would be very helpful to input (part of) the alias of the node(s) instead of the channel number.
Thanks for your work!

[C-Otto]

Let's do #181 and #182 first :)

[ErhardDu]

Greets from nrw2nrw :)