Self-Vote for Staking (among others.) (#2078)

* initial doc for the staking module

* Remove md style links.

* Remove todos.

* Add rust code types

* Rename and fix review notes.

* Add new md file

* Final touches.

* Migrate compleatly to rustdoc

* Update link

* Fix heading

* Final touches wrt the new template.

* Remove empty prereq.

* Fix more reviews

* Some final nits.

* Fix some side issues.

* Fix another set of reviews

* Fix + stabilize leftover reivews.

* Remove unused test parameters

* Fix typo.

* Merge redundant loops

* Adds phantom self-vote

* Fix broken tests.

* Refactor some names to match the reference.

* Remove redundant inner loops from election round.

* Introduce phragmen post-processing.

* Some fixes and todos.

* Fix some tests with new phragmen params

* Fix test

* Bump spec

* Fix wasm build

* Fix tests and phragmen fallback. Avoid double-controlling

* Fix and rebuild wasm

* Whitespaces, whitespaces everywhere.

* Rebuild

* Disable post-processing.

* Identify by stash, not controller account.

* Couple of fixes

* Fix first test

* Fix invulnerability_should_work

* Fix a couple more tests

* Fix more tests

* Fix more tests

* Fix more tests

* Fix some tests

* Fix update-ledger.

* Fix update-ledger.

* Fix another test

* Fix another test

* Fix rest of staking tests

* Remove printlns

* Rebuild wasm

* Fix & tests for auth/val syncing

* Fix up threading for tests

* Remove superfluous asserts

substrate/node/cli/src/chain_spec.rs

@@ -107,7 +107,6 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 			current_era: 0,
 			offline_slash: Perbill::from_billionths(1_000_000),
 			session_reward: Perbill::from_billionths(2_065),
-			current_offline_slash: 0,
 			current_session_reward: 0,
 			validator_count: 7,
 			sessions_per_era: 12,
@@ -263,7 +262,6 @@ pub fn testnet_genesis(
 			bonding_duration: 2 * 60 * 12,
 			offline_slash: Perbill::zero(),
 			session_reward: Perbill::zero(),
-			current_offline_slash: 0,
 			current_session_reward: 0,
 			offline_slash_grace: 0,
 			stakers: initial_authorities.iter().map(|x| (x.0.clone(), x.1.clone(), STASH, StakerStatus::Validator)).collect(),