Set or get the fetch_state of a page

Usage:

           $page->fetch_state

or
           $page->fetch_state($state)

During the retrieval process a page can have the follwing states:

• FRESH the page object was generated, but nothing has beed done to the page
• SCHEDULED the page object was scheduled for retrieval
• RETRIEVED the page object was retrieved sucessfully or unsuccessfully via a http GET method
• SAVED the page was saved to the disk and the content was destroyed (see destroy).

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