dh_installchangelogs is a debhelper program that is responsible for installing changelogs into package build directories.
dh_installchangelogs determines if the package is a debian native package, and if so, it installs debian/changelog into usr/share/doc/package/changelog in the package build directory. Otherwise, it installs debian/changelog into usr/share/doc/package/changelog.Debian in the package build directory. (If files named debian/package.changelog exist, they will be used in preference to debian/changelog.)
Keep the original name of the upstream changelog. This will be accomplished by installing the upstream changelog as ``changelog'', and making a symlink from that to the original name of the changelog file. This can be useful if the upstream changelog has an unusual name, or if other documentation in the package refers to the changelog file.
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