Add new --w3c-field-regex option to log importer which allows specifying regex for any w3c extended log field. Can combine this option w/ --regex-group-to-...-cvar options to track any field that the importer doesn't natively recognize.

Replace --api-to-cvar params with --regex-group-to-cvar options in log importer for greater flexibility. Added an --ignore-groups parameter to allow ignoring certain parsed groups (like userid). Also added available regex groups to log-format-regex documentation (not added in generic way unfortunately).

Several changes and fixes to the calendar, visitor log truncation, pleinelune deprecated, new UserLanguage plugin

refs #6705 fix integration tests that have changed as a user metric is no longer returned in those examples

This language is shown when development mode is enabled.

Add option to map API tracking parameter to custom variable in log importer script. Includes change to ImportLogs system test and fix for import log custom variable handling (old behavior was to not set multiple custom variables if they were set already instead of simply adding custom variables).

Refactoring entire branch, moved most of logic to command class, turned DuplicateActionRemover into a DAO that only deals w/ duplicate actions, created two new DAO classes (one for log_action manipulation and one for getting relational table metadata), deprecated SHOW COLUMNS method in Db in favor of new table metadata DAO, and added & fixed tests.

Add tests for action ID related methods in Tracker/Model.php and fix group bys in Tracker/Model.php and TableLogAction.

Fixes #6436, fix concurrency issue regarding duplicate actions by always using least idaction and deleting duplicates when they are found to be inserted. Since tracker process can potentially fail before duplicates are removed, added test to make sure reports work when duplicate actions exist in the DB.

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

Ideally this would be only on developer.piwik.org but I think it is not explained there - yet.