Many changes

1. Add additional_info for class Logger::write()
2. (Bug) Logger::write(): wrong IP address
3. (Bug) Post::init(): wrong error handling
4. Texts::getTextFromTitle(): allow locked titles when debugging
5. (Bug) GoogleImgSearch: Use an alternative approach to retrieve image urls
6. RssReader: for RSS, use the top level link and title if no items found
7. (Bug) table.php: duplicate table content
8. (Bug) text_mgr.php: escape HTML when testing plugins
9. (Bug) text_mgr.php: clear testing results when changing titles
10. (Bug) text_mgr.php: Firefox memorizes values, so reset the content
    in selectTitleByUrl()