Update liferea to 0.5.2.

Changes:
	* A middle mouse click on the itemlist now toggles
	  read status or the headline flag depending on the
	  column you click. (Lars Lindner)
	* Now favicons that are older than one month are
	  automatically updated (Lars Lindner)
	* The search result now provides an extra column with
	  the favicon of the feed the found headline belongs to.
	  (Lars Lindner)
	* The mozilla browser module now respects the configured
	  proxy settings. (Lars Lindner)
	* Feed and item information is now properly localized.
	  (Lars Lindner and Nathan Conrad)
	* Popup menu for the systray icon. (James Bowes)
	* Improvements for the favicon handling. favicon.ico files are now
	  retrieved from the webserver path where the feed is
	  located. favicon.ico in the webserver root is tried only if this
	  first attempt fails. favicons are now redownloaded every 30
	  days. (Lars Lindner & Nathan Conrad)
	* Liferea now saves when the mainwindow is maximized.
	  (Marc Deslauriers)
	* The gnomevfs2 dependency from GtkHTML2 was removed.
	  (Nathan Conrad)
	* 0.5.1 did falsely encode HTTP URL hash marks as %23.
	  This is fixed now. (Lars Lindner)
	* When a feed source command is executed a useful return
	  code is set so it won't be unavailable due to missing
	  status information. (Christophe Barbe)

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