entities similar to #20882 get __pkginfo__ to read its data from PKG-INFO
Blog entry, Card, Email, ExtProject, File, License, Link, Mailing-list, Project, Tag, Ticket, Version (3)COUNT(tagged by)
#2888 lgp check ignore manifest "prune" command1
#23006 copyright field is not necessary1
#19637 MANIFEST.in does warn about unmatched file in subdirectory1