- Added option page for overview settings.
- Removed references to local WP_Staistics classes and replaced with global $WP_Statistics.
- Updated install routine to use new settings code.
- Added conversion code to upgrade.php for new settings code.

git-svn-id: https://plugins.svn.wordpress.org/wp-statistics/trunk@945215 b8457f37-d9ea-0310-8a92-e5e31aec5664