Epoch phase performance improvements, access node open slot limits, and EpochStart event (#379)

* adds performance improvements to end of epoch operations

* construct proposed list within endStakingAuction

* make ci

* add first draft of open node slots code

* adds automatic open access node slots and a test

* add epoch start event

* make ci

* address PR comments

* use borrow for storage instead of load

* use borrow for more operations

* address PR comments

* use .remove

* add timing config struct

* add getter/setter, target time getter

* update constructor

* add transactions

* begin test updates

* add precondition that ref epoch in the past

guarantees time computation doesn't underflow

* add config update tests

* rm unused method

* test getting future epoch target end time

* adds performance improvements to end of epoch operations

* construct proposed list within endStakingAuction

* make ci

* add first draft of open node slots code

* adds automatic open access node slots and a test

* add epoch start event

* make ci

* address PR comments

* use borrow for storage instead of load

* use borrow for more operations

* address PR comments

* use .remove

* add epoch counter arguments to rewards and new epoch events

* [FLIP 204] Add `targetDuration` to `EpochSetup` (#396)

* add duration to EpochSetup

This is needed to compute tau, the steady-state optimal time/view,
in the cruise control system

* update generated files

* update tests

* tidy

* tidy

* add duration to refTimestamp

* make ci

---------

Co-authored-by: Jordan Schalm <[email protected]>

Author: joshuahannan

.gitignore

@@ -13,5 +13,5 @@ node_modules
 .vscode
 git
 
-
+coverage.json
 flow.json

SECURITY.md

@@ -15,75 +15,4 @@ Reports are welcome! Please definitely reach out to us if you have a security co
 If you believe you may have found a security vulnerability in our project,
 to be on the safe side, **do NOT open a public issue**.
 
-Rather, we prefer you to please send us an email: **[email protected]**
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-To encrypt messages to us, we encourage you to use our PGP key:
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