Major fixes in filters/extensions, other improvements:

Major fixes in filters/extensions, other improvements:
- Major bug in filter removal fixed (was rewritten to use own filter 'run_sqls')
- Removed guest menu from SQL files and added to ext-online.php
- Filters added to same extension
- UPDATE_LOGIN_DATA() rewritten as filter
- Some documents updated
- Admin footer template now with closing "li" tags and title attribute for guest
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