Imrpoving the batch process of deleting duplicate feed items.
Create a queue worker for delete orphans feed items which older then 1 month.
Add comment.
Minor typo.
Use the normal cron.
Set OS reader cron to run each month.
Adding the export.
Dispaly message when runing the update in drush and delete revision tabkle.
Merge branch 'SCHOLAR-3.x' into 4958
Merge pull request #4969 from openscholar/4958

Delete feed items over 1 month and improve the removal of duplicate feed items.