* guix/upstream.scm (update-package-inputs)[filtered-inputs]
[regular-inputs, native-inputs, propagated-inputs]: New procedures.
Use them in 'update-field' calls.
* tests/guix-refresh.sh (GUIX_TEST_UPDATER_TARGETS): Add "libreoffice"
to the dependencies of "the-test-package". Add 'updater-ignored-inputs'
property to "the-test-package".
* doc/guix.texi (Invoking guix refresh): Document it.