Split up UserSettings BC (move request forwarding to appropriate plugins) & split up the tests for that BC.

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

refs #4609

renaming Unzip to Uncompress,
Renaming Tracker/Referer to Tracker/Referrer,
and few more

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

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

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

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refs #71
 * PDFReports major refactoring. Any plugin can now add new kinds of reports. Required for #2708 and #3118.
 * test report functionality ($idReport == 0) dropped in Piwik_PDFReports_API->generateReport()
 * All Websites report shows 3 more metrics: Goal Conversions, eCommerce Conversions and eCommerce Revenue. Can be removed if asked to.
 * Piwik_PDFReports_API->sendEmailReport renamed to sendReport
 * All Piwik_PDFReports_API method signatures updated to support generic report parameters
refs #389
 * new API method to retrieve only one Piwik site : Piwik_MultiSites_API->getOne()
 * per #2708 description, Piwik_MultiSites_API methods now support a new parameter named enhanced. When activated, Goal Conversions, eCommerce Conversions and eCommerce Revenue along with their evolution will be included in the API output.
 * API metrics refactored in (@ignored)Piwik_MultiSites_API->getApiMetrics()
 * Metadata now returns 12 metrics : nb_visits, visits_evolution, nb_actions, actions_evolution, revenu, revenue_evolution, nb_conversions, nb_conversions_evolution, orders, orders_evolution, ecommerce_revenue, ecommerce_revenue_evolution
refs #3118
 * ReportPublisher plugin could now easily be implemented
commits merged
 * r6243
 * r6422 (#3012)
TODO
 * the MobileMessaging settings page may need some embellishment
 * @review annotations need some attention
 * test if the MultiSites API evolutions have some impact on Piwik Mobile and other client code

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refs #2857 fixed id collisions in modal confirm windows by using an role attribute instead of id

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