Fixing two bugs in image tracking link generator: only first & was replaced w/ &amp; in link and link text was never displayed.
Minor
throw exception in case someone wants to cache an object
refs #4053 make core plugin detection available from the outside
refs #4053 improved style of feedback success message
refs #4053 cleanup code of marketplace integration
refs #4053 fix inactive plugins were not considered in the update check
refs #4053 use nonces for all plugin operations (even for deactivate and uninstall)
refs #4053 the version class is no longer used
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.
Output exception backtrace also if PIWIK_TRACKER_DEBUG is defined.
Moved/renamed DataTableVisualization to ViewDataTable\Visualization and moved Graph to ViewDataTable\.
Adding link in UI, in case of error, to troubleshooting FAQ for LOAD DATA INFILE
Merge remote-tracking branch 'origin/master'
Adding more debug output and show output in travis to try and solve deadlocking issue.
Fix debugTrace output.
Fix syntax error from last build
fixed translation usage
removed some unused translation keys; updated language files
Remove use of Zend_Registry to hold DB connections.