Lintian tag information: duplicate-packaging-file (type: warning)

Description (from lintian-explain-tags)

Some packaging files obtain different names when they are copied from
source to installation packages. Debhelper sometimes adds *.Debian
extensions to NEWS, README and TODO files. That can be confusing.

Debhelper's behavior also depends on the filename.

This source package contains both a file with the proper name and also a
file with incorrect name. Please remove the file as indicated.

Please merge all relevant information into the surviving file.

Please refer to Bug#429510 and Bug#946126 for details.

Visibility: warning
Show-Always: no
Check: debian/filenames

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