Should always be called to avoid the "An element could not be located on the page" error
=head2 capture
$c->capture
Capture a screenshot and upload it using the excellent lut.im service provided by framasoft
The url of the image will be printed on STDERR (it should be better to return it instead)
=head1 AUTHORS
Jonathan Druart <jonathan.druart@bugs.koha-community.org>
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