removed unused variables and dead code

core/Nonce.php

core/Updater.php

js/tracker.php

misc/others/geoipUpdateRows.php

misc/others/test_generateLotsVisitsWebsites.php

plugins/API/ProcessedReport.php

plugins/API/RowEvolution.php

plugins/Actions/API.php

plugins/CoreVisualizations/JqplotDataGenerator/Evolution.php

plugins/CoreVisualizations/Visualizations/Cloud.php

plugins/Goals/Visualizations/Goals.php

plugins/ImageGraph/StaticGraph.php

plugins/LanguagesManager/Commands/CompareKeys.php

plugins/Live/Visitor.php

plugins/MultiSites/API.php

plugins/Referrers/API.php

plugins/SegmentEditor/SegmentSelectorControl.php

plugins/Transitions/API.php

plugins/UsersManager/LastSeenTimeLogger.php

...nchmarks/Fixtures/ThousandSitesTwelveVisitsEachOneDay.php