Debug info added for chasing down memory exhaustion problem.

git-svn-id: https://plugins.svn.wordpress.org/email-users/trunk@832355 b8457f37-d9ea-0310-8a92-e5e31aec5664
Debug info added for chasing down memory exhaustion problem.

git-svn-id: https://plugins.svn.wordpress.org/email-users/trunk@832356 b8457f37-d9ea-0310-8a92-e5e31aec5664