Change the permission required for 'Add Contacts to Group' in reports to be consistent with other workflows

Currently 'administer Reports' permission is required to expose 'Add Contacts to Group' in any report. (Of course 'view all contacts' or some ACL granting permission to a set of contacts is also required or report results will be empty.)

'administer Reports' is not the right requirement, as we required 'edit all contacts' or an equivalent ACL allowing editing in the rest of the user interface to allow 'add to group'. The same rule should be enforced for reports.