Adding test for archiving_range_force_on_browser_request option addition that makes sure range archiving is correctly enabled/disabled.

The query log is momentarily disabled when the database log handler inserts in database

Cannot add tests for the screen backend because I would need to mock the session, which is not possible right now because it's all static stuff.

Do not create new visit if no referrer info in current action, but referrer info present in last action. Also add integration + system tests for new behavior.

- the error handler logs warnings and notices, and turns errors into exceptions (`ErrorException`)
- the exception handler catches all uncatched exceptions and display them to the user (HTML or CLI)
- the "screen" logging backend has been removed
- I've normalized exceptions/errors shown to the user in HTML (wether they are catched by the FrontController or not)

This is so the FileHandler can be replaced by Monolog's StreamHandler

This class can be used in tests to create a specific environment (e.g. the prod environment, CLI environment, etc...)

fixes https://github.com/PiwikPRO/plugin-InterSites/issues/2 Added notification to user when Config not setup properly + Update system tests to set the new required config

fixes #6824 Hash the fingerprint with the website ID to make it different on each website for a given user + tests

The ultimate prize and final step to close the issue: do not group by the whole set of matched rows, way too slow on huge datasets!