simplenews_statistics 6.x-3.0-alpha4

This release makes a full transition to views. All administrative views (tables for clicks and opens) are now implemented in views.

#1530474: BIG permission problem! Permission problems in built-in views (anonymous user had acces to adminstrative views)
#1477736: Make email link statistics optional Make email link statistics optional
#1470918: Postgres error on admin/content/simplenews/statistics/[node-id]/clicks, #1419668: Replace statistics pages with views, #1419684: Tabs opens and clicks don't work correctly, #1300716: add cron send date, add details for opens, and integrate views filters, #1404832: Create statistics link/tab on the node No more custom queries (full views integration for administrative overviews)
Lots of code-style fixes