[poppler] annotations survive in saveas copy AFTER removing them

[Jannick]

On Sat, 15 Jul 2017 02:05:43 +0200, Jannick wrote:

> Moreover, the function Annots::removeAnnot() should essentially do the job

Effectively Page::removeAnnot() should be called which unfortunately crashes 
due to a bug in poppler 0.56.0. 
Bug filed with proposed, but certainly not final patch - https://bugs.freedesktop.org/show_bug.cgi?id=101795.

Thanks,
J.