Fine-grained tests for herg QC

[kwabenantim]

Description

Supports #21

• Each QC check (qc_1(), qc_2(), etc.) now returns (bool, value) tuples indicating pass/fail and the checked value.
• hERGQC.run_qc() now returns a QCDict object which contains the results from all QC checks.
  • QCDict.all_passed() returns a bool for whether all checks passed.
  • QCDict.passed_list() returns a list of bools, one for each check.
  • QCDict.qc_passed(label) returns a bool for a specific check.
• Each QC is now tested on all wells, with a list of known failing wells for each check.
• Each QC check is also tested with artificial data.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Testing

• Testing is done automatically and codecov shows test coverage
• This cannot be tested automatically

Documentation checklist

• I have updated all documentation in the code where necessary.
• I have checked spelling in all (new) comments and documentation.
• I have added a note to RELEASE.md if relevant (new feature, breaking change, or notable bug fix).

[codecov]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

Thanks for integrating Codecov - We've got you covered ☂️

[joeyshuttleworth]

Would it be possible/worth it to rewrite QCDict so that it inherits from UserDict? It seems like we're replicating a few basic dictionary functions. It might not be worth the effort, but if it's simple to do it might simplify the code a little bit