Lintian tag information: copyright-refers-to-old-directory (type: error)

Description (from lintian-explain-tags)

The common licenses (GPL, BSD, Artistic, etc) have been moved from
/usr/doc/copyright to /usr/share/common-licenses. Copyright files should
be updated.

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

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

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