Refactor and remove sort from apply dampening

Check for existence of manifest

Merge pull request #198 from autoSteve/Hard-limit-by-API-key

Proposed v4.2.5

Update __init__.py

Prevent API key check after 429

Cope with site_damp entry option being None

Correct sites load status logging

Update README.md

Compact INFO logging of auto-update schedule

Merge pull request #165 from autoSteve/Detailed-forecast-sites-breakdown

Proposed v4.1.8 pre-release