new version extra memory and disk swap usage stats

git-svn-id: https://plugins.svn.wordpress.org/strictly-system-check/trunk@948032 b8457f37-d9ea-0310-8a92-e5e31aec5664
forgot to save readme.txt

git-svn-id: https://plugins.svn.wordpress.org/strictly-system-check/trunk@948034 b8457f37-d9ea-0310-8a92-e5e31aec5664