* gnu/packages/cups.scm (cups-minimal, cups): Update to 2.4.2.
[arguments]: Remove --disable-* #:configure-flags as they do nothing.
Add (different) --without-* ones that do.
Run a newly passing test; skip a newly failing test.
[home-page]: Link to specific subdirectory.
[description]: Better describe the state & direction of the project.
* gnu/services/cups.scm (comma-separated-string-list-or-#f?)
(serialize-comma-separated-string-list-or-#f): New procedures.
(cups-configuration): Update <default-auth-type> and
<browse-dns-sd-sub-types> defaults.
Remove obsolete <classification>, <listen-back-log>, <page-log-format>
and <rip-cache> fields.
Add new <max-subscriptions>, <max-subscriptions-per-job>,
<max-subscriptions-per-printer>, <max-subscriptions-per-user>, and
<ready-paper-sizes> ones.
* doc/guix.texi (Desktop Services): Likewise for their documentation.
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