* master:
  Fix some formatting grumbles (#501)
  remove the extra ? in the license header (#500)
  NetworkService::new starts the network (#462)
  Availability/Extrinsic store (#465)
  Add doc to install a specific tagged version (#497)

Use core

* master:
  --version commit hash - style improvement (#496)
  Send initial values with subscription. (#493)
  Improve docker image size with a 2 stages image (#463)

* Update lib.rs

* Update lib.rs

* Update config.rs

* Update lib.rs

* Update lib.rs

* tab correction

* Send initial value for heads.

* Send initial values for subscriptions.

* Improve docker image size with a 2 stages image

* Minor doc updates

* Fix and reduce size of the docker image

* Fix paths in scripts

* master:
  Add Links to Tags and House Style (#413)
  Add seed generation tests (#476)
  Added commit hash to --version (#489)
  use write_all instead of write (#488)
  should be MAX_IMPORTING_BLOCKS (#486)
  Use hex_literal in tests, use rustc-hex from crates (#481)
  Lower bft timeout (#483)
  force BFT delay in consensus service, not in proposer logic (#477)