Fixes #2791, committed codax's patch after modification. Two new reports added, getSocials & getUrlsForSocial. New utility function for DataTable called mergeSubtables added. Modified ColumnCallbackDeleteColumn filter so the function callback used can take extra parameters.


git-svn-id: http://dev.piwik.org/svn/trunk@7466 59fd770c-687e-43c8-a1e3-f5a4ff64c105