Can send/receive should be adjusted by reserved balance and commit fee

[eliotcougar]

This is a basic clarity issue... When the channel info says it can receive 5000 sats, and the reserved balance says 10000 sats - it means you cannot receive at all... Same thing with sending... The "can send" and "can receive" numbers in the channel info and the checks when creating invoices should take reserved balance and commit fee into account...

[Eternumkr]

a better solution to this would be to remove the reserve all together for the private channels.

[hsjoberg]

Issue about removing chan reserve here: https://github.com/hsjoberg/blixt-wallet/issues/812