Added selection and popup for <pre> tags within wikitext. Also fixed more bugs found in the HTML paragraph parser (mostly self-closing tags e.g. <hr />).
# Used for testing mod_rewrite.
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) install.php?do=modrewrite_test&str=$1
</IfModule>