* dont set empty targets, return correct errors from netstore

* seekjoiner: prefetch entire read buffer
* integrate langos (#674)

* add tracing to pusher

* encryption: add elgamal package to support pss encryption

* encryption: add Key accessor to interfaces

* encryption,elgamal:renaming and comments

* typo

* granular notifiers in protocol spec

* remove debugapi toplogy notifier

* fix tests and return toploguy notifier but a bit different

* fix tests

* please linter

* remove unnecessary pointer

* protocolsmu

* protocolsmu

* tests

* Add chequebook/balance  &  /chequebook/address debug api endpoints
* Basic unit tests

* move pipeline components to individual packages

* kademlia: wait for peers to be added to the backing data structure

Safety checks in accounting
Correct restoring balance after unsuccessful payment
Added code comments for arithmetic safety related parts
Co-authored-by: Pavle Batuta <pavle@batuta.xyz>

* add pss websocket api for opening a persistent connection for incoming messages on a given topic
* add pss message send api to send outgoing messages