I9148 user menu

Unset host+port for MySQL PDO if unix_socket is non-empty

Make sure local time has valid time format

Add 'all' in the Row count selector to be able to display all rows, and optionally export them all

Make transtion and overlay row actions extendable by other plugins

Added feature Custom Dimensions

removed unused line from codebase

Breaking a string into two strings to prevent regression as this string is used in other places (scheduled report UI)

fix system tests and fix an error where we did not pass the correct siteId when saving measurable settings

 fix a problem issues #9257 https://github.com/piwik/piwik/issues/9257

Fixing issues causing omnifixture setup to fail.

Re-use the Common::mb_substr method.

Bugfix

PHP's function substr calls unreadable characters, because it cuts mu…