tweak flushing of permalinks and startup options. Upgrade plugin version.

git-svn-id: https://plugins.svn.wordpress.org/bepro-listings/trunk@822073 b8457f37-d9ea-0310-8a92-e5e31aec5664
tweak documentation

git-svn-id: https://plugins.svn.wordpress.org/bepro-listings/trunk@822078 b8457f37-d9ea-0310-8a92-e5e31aec5664
tweak documentation

git-svn-id: https://plugins.svn.wordpress.org/bepro-listings/trunk@822079 b8457f37-d9ea-0310-8a92-e5e31aec5664