Jane Tournois adeb6b391e add error message ... when zlib version is < 1.2.9, it is not possible to save an image as .inr, it has to be .inr.gz no matter if zlib is available or not this commit adds an error message to help the user understand the error		2019-12-05 16:29:11 +01:00
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CGAL	add error message	2019-12-05 16:29:11 +01:00