Piwik is a free/libre analytics platform. Refs #4455 GNU Package requirement to use free/libre instead of open source

Refs #4439 Registering the callback in the frontcontroller and using a static method rather than a closure

if a plugin causes a fatal error, offer the possibility to disable or uninstall the plugin, work is still in progress

Removed many Piwik_ functions, in Piwik 2 it is best practise to use the methods calls instead

Todo: finish converting core/ classes + convert plugins/ classes to use \Piwik\Plugin namespace + fix build + Merge master

Refs #4059 Work in progress: Conversion to use Namespaces: Period*, Metrics, Segment, SegmentExpression, PluginsManager.
Removed some deprecated code.

Converting Piwik core source files, PHP, JS, TPL, CSS

More info: http://piwik.org/participate/coding-standards/

The fact that errors are displayed is one of the key factors that help us troubleshoot users, losing error and NOTICES messages would be a lot more support pain...

we still recommend power users to set it to off: http://piwik.org/security/how-to-secure-piwik/



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fixes #3009 - display_errors now defaults to disabled; leaving PhpSecInfo "as is" because ini_set("display_errors", "stderr") is still leaky

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update comments in example; refactor file_get_contents, so compat functions are in one place; fixes #2292

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refs #1760, refs #1573 - undo change to index.php; integrator has to wrap this in their own try...catch

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- index.php, piwik.php - no longer set include path
- libs/Zend - comment out require_once per http://www.zendframework.com/manual/e
n/performance.classloading.html
- libs/Zend - comment out some redundant Zend_Loader::loadClass() calls
- libs/HTML - use absolute include paths
- libs/open-flash-chart/php-ofc-library - use absolute include paths



git-svn-id: http://dev.piwik.org/svn/trunk@2118 59fd770c-687e-43c8-a1e3-f5a4ff64c105

 - Added timezone setting per website. Added API to fetch the list of supported timezones. UTC Manual offsets are supported even if the PHP doesn't have timezone support built in. 
 - Added default timezone setting that the Super user can set. It will be used to pre-select timezones when creating new websites, or setting the default timezone when adding websites via the API without specifying the timezone.
 - Default timezone set to UTC to all existing websites on update. PHP Default timezone set to UTC in index.php and piwik.php.
 - Removed all usage of mysql date/time functions (which are internally doing timezone conversions based on mysql timezone), now using php generated timestamps (in UTC), or dates manually converted to the website timezone.
 - Altered the few Mysql fields that were defaulting to "Current timestamp", they now default to NULL.
 - Deprecated the field log_visit.server_date and log_conversion.server_date as they are now not used. Must use DATE(visit_last_action_time) instead. Note that the new INDEX on (idsite, visit_last_action_time, config_md5config) will greatly benefit the Live! plugin.
 - Deprecated Piwik_Date->get, must now use Piwik_Date->toString
 - Deprecated the DB adapters getCurrentTimezone() feature, as we now don't rely on the DB timezone. Also removed the warning from the install screen.

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