Suppressed session_start() outputs.

git-svn-id: https://plugins.svn.wordpress.org/cleantalk-spam-protect/trunk@802268 b8457f37-d9ea-0310-8a92-e5e31aec5664
Removed approvement state changes for old authors of the blog's comments. Made a lot of code optimizations.

git-svn-id: https://plugins.svn.wordpress.org/cleantalk-spam-protect/trunk@802333 b8457f37-d9ea-0310-8a92-e5e31aec5664
2.21 ready.

git-svn-id: https://plugins.svn.wordpress.org/cleantalk-spam-protect/trunk@803499 b8457f37-d9ea-0310-8a92-e5e31aec5664
Readme fixed.

git-svn-id: https://plugins.svn.wordpress.org/cleantalk-spam-protect/trunk@803543 b8457f37-d9ea-0310-8a92-e5e31aec5664
Readme fixed.

git-svn-id: https://plugins.svn.wordpress.org/cleantalk-spam-protect/trunk@804755 b8457f37-d9ea-0310-8a92-e5e31aec5664