Lintian tag information: named-copyright-for-single-installable (type: warning)

Description (from lintian-explain-tags)

Every package must include the file /usr/share/doc/*pkg*/copyright. A copy
of this file should be in debian/copyright in the source package.

These sources ship a copyright file named according to debhelper
convention debian/$package.copyright but build only one installable.
Please move the copyright file to debian/copyright.

Please refer to Copyright information (Section 12.5) in the Debian Policy
Manual for details.

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

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