When deleting old comments, allow both the maximum age of comments in the spam queue and the number of comments to be deleted in each batch to be filterable.

To change the number of comments deleted at a time, filter akismet_delete_comment_limit.

To change the maximum age of a comment in the spam queue before it's deleted, filter akismet_delete_comment_interval.


git-svn-id: https://plugins.svn.wordpress.org/akismet/trunk@1003398 b8457f37-d9ea-0310-8a92-e5e31aec5664