added option to select all and delete multiple links

git-svn-id: https://plugins.svn.wordpress.org/wp-auto-affiliate-links/trunk@952167 b8457f37-d9ea-0310-8a92-e5e31aec5664
added another FAQ to the list

git-svn-id: https://plugins.svn.wordpress.org/wp-auto-affiliate-links/trunk@952172 b8457f37-d9ea-0310-8a92-e5e31aec5664