Fix some issues reported by lintian
Use versioned copyright format URI. (unversioned-copyright-format-uri)
debian/copyright: use spaces rather than tabs to start continuation lines. (tab-in-license-text)
Bump debhelper from deprecated 9 to 13. (package-uses-deprecated-debhelper-compat-version)
Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
Update standards version to 4.1.1, no changes needed. (out-of-date-standards-version)
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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/iucode-tool/44d1d81d-eff9-4973-ab9d-289ed7fcd285.