Implemented Flattr changes

Added a button to say if the article is flattrable or not and how many
people have flattred this object.
Fixed errors and changed source of flattrs

Fixed errors, and the number displayed is no longer the number of peope
who has flattred an article, but the number of flattrs he has got.
Fixed bugs, added a flattr button and an option

There's a button and an option in define.inc.php to show the button or
not.
Merge branch 'Flattr' of git://github.com/tcitworld/poche into tcitworld-Flattr

Conflicts:
	inc/3rdparty/site_config