Fixes #4156 Adding ORDER BY clause when DELETING so that it works with replication
https://dev.mysql.com/doc/refman/5.1/en/replication-features-limit.html
(cherry picked from commit ce6254e3)

In broadcast.js ajax page load, if response is an HTML page with a Piwik error, display the error instead of doing nothing.

Show success message after a scheduled report is successfully sent when 'Send report now' is clicked.

Move UserCountry specific logic out of core tracker files and into UserCountry plugin and remove some uses of Zend_Registry in tests.

Refs #4041, fix bug where columns query parameter was not correctly overriding default value of columns_to_display display property.

Moved/renamed DataTableVisualization to ViewDataTable\Visualization and moved Graph to ViewDataTable\.

Make sure all calls to Piwik_ExitWithMessage provide backtrace if available, and only print the backtrace if PIWIK_PRINT_ERROR_BACKTRACE is defined. Modified archive cron test to print backtrace if request made by archive cron test fails.

Fixing two bugs in image tracking link generator: only first & was replaced w/ & in link and link text was never displayed.