not supporting interlaced PNGs

[Ralf Hildebrandt]

I tried to change the OTRS product logo -- then printing give me an apache server error. Looking at the server's error.log:

[Fri Feb 17 13:45:39.506928 2017] [:error] [pid 29444] [Fri Feb 17 13:45:39 2017] -e: Unsupported Interlace(1) Method at /usr/share/perl5/PDF/API2/Resource/XObject/Image/PNG.pm line 45.\n
[Fri Feb 17 13:46:27.175532 2017] [:error] [pid 29185] [Fri Feb 17 13:46:27 2017] -e: Unsupported Interlace(1) Method at /usr/share/perl5/PDF/API2/Resource/XObject/Image/PNG.pm line 45.\n

I then reported a bug with otrs:
https://bugs.otrs.org/show_bug.cgi?id=12629

The answer was: "that is a limitation in the underlying PDF::API2 library that we use"

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: libpdf-api2-perl 2.025-1
ProcVersionSignature: Ubuntu 4.4.0-64.85-generic 4.4.44
Uname: Linux 4.4.0-64-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Thu Feb 23 13:39:46 2017
InstallationDate: Installed on 2016-05-26 (272 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
PackageArchitecture: all
SourcePackage: libpdf-api2-perl
UpgradeStatus: No upgrade log present (probably fresh install)