* komentarz w fiksturce jest w tagu <p>
* poszerzenie modelu komentarza o nowe pola
* dodanie modelu Trackback
* poszerzenie modelu Wpis o content
* COMMENT_CONTENT, COMMENT_NICK, COMMENT_DATE, COMMENT_HOUR, COMMENT_ID, COMMENT_NUMBER
* COMMENT_ALLOWED_BLOCK, COMMENT_NONE_BLOCK, COMMENT_BLOCK_NOT_EXIST, COMMENT_BLOCK_EXIST, TRACKBACK_BLOCK_EXIST