fixes #1312

- index.php, piwik.php - no longer set include path
- libs/Zend - comment out require_once per http://www.zendframework.com/manual/e
n/performance.classloading.html
- libs/Zend - comment out some redundant Zend_Loader::loadClass() calls
- libs/HTML - use absolute include paths
- libs/open-flash-chart/php-ofc-library - use absolute include paths



git-svn-id: http://dev.piwik.org/svn/trunk@2118 59fd770c-687e-43c8-a1e3-f5a4ff64c105