Upgrading to LionWiki 2.1

There's not much to say. LionWiki 2.1 is rather smaller upgrade.

Things which need to be overwritten:

• core LionWiki index.php
• plugins. If you have some custom plugins for LionWiki 2.0, they should work seamlessly.
• templates. There were some small changes in template handling, however custom templates (for 2.0) should work without problems.

Format of database and syntax stays the same.