build-system/python: 'package-with-explicit-python' uses 'eq?' memoization.

* guix/build-system/python.scm (package-with-explicit-python): Use
'mlambdaq' instead of 'mlambda'.  This does not change the <package>
graph and has no visible impact on performance.

gnu-maintenance: 'gnu-package?' uses 'eq?' memoization.

* guix/gnu-maintenance.scm (gnu-package?): Use 'mlambdaq' instead of
'mlambda'.

packages: Remove 'define-memoized/v' and use 'mlambdaq' instead.

* guix/packages.scm (define-memoized/v): Remove.
(package-transitive-supported-systems): Use 'mlambdaq' instead of
'define-memoized/v'.
(package-input-rewriting)[replace]: Likewise.

Use 'mlambda' instead of 'memoize'.

* gnu/packages.scm (find-newest-available-packages): Use 'mlambda'
instead of (memoize (lambda ...) ...).
* gnu/packages/bootstrap.scm (package-with-bootstrap-guile): Likewise.
* guix/build-system/gnu.scm (package-with-explicit-inputs)[rewritten-input]:
Likewise.
* guix/build-system/python.scm (package-with-explicit-python)[transform]:
Likewise.
* guix/derivations.scm (derivation->string): Likewise.
* guix/gnu-maintenance.scm (gnu-package?): Likewise.
* guix/modules.scm (module-file-dependencies): Likewise.
* guix/scripts/graph.scm (standard-package-set): Likewise.
* guix/scripts/lint.scm (official-gnu-packages*): Likewise.
* guix/store.scm (store-regexp*): Likewise.
* guix/utils.scm (location): Likewise.

Add (guix memoization).

* guix/combinators.scm (memoize): Remove.
* guix/memoization.scm: New file.
* Makefile.am (MODULES): Add it.
* gnu/packages.scm, gnu/packages/bootstrap.scm,
guix/build-system/gnu.scm, guix/build-system/python.scm,
guix/derivations.scm, guix/gnu-maintenance.scm,
guix/import/cran.scm, guix/import/elpa.scm,
guix/modules.scm, guix/scripts/build.scm,
guix/scripts/graph.scm, guix/scripts/lint.scm,
guix/store.scm, guix/utils.scm: Adjust imports accordingly.

doc: Fix typos.

Fixes a regression introduced in commit
f31f1acac2efb4bc6558b604a07b56f826423177.

Reported-by roptat on #guix.

* doc/guix.texi (Invoking guix build): Use "@@" instead of "@".

gnu: Add emacs-mu4e-alert.

* gnu/packages/emacs.scm (emacs-mu4e-alert): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

gnu: Add emacs-alert.

* gnu/packages/emacs.scm (emacs-alert): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

gnu: Add emacs-gntp.

* gnu/packages/emacs.scm (emacs-gntp): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

gnu: Add emacs-log4e.

* gnu/packages/emacs.scm (emacs-log4e): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

gnu: Add emacs-ht.

* gnu/packages/emacs.scm (emacs-ht): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

gnu: tvtime: Update to 1.0.11.

* gnu/packages/tv.scm (tvtime): Update to 1.0.11.

gnu: manaplus: Update to 1.7.1.21.

* gnu/packages/games.scm (manaplus): Update to 1.7.1.21.

doc: Fix typos.

* doc/guix.texi: Use "@" for package specifications.

gnu: transmission-remote-cli: Superseded by tremc.

* gnu/packages/bittorrent.scm (transmission-remote-cli)[properties]: New field.

gnu: Add tremc.

* gnu/packages/bittorrent.scm (tremc): New variable.

doc: Clarify "Installing GuixSD in a VM".

* doc/guix.texi (Installing GuixSD in a VM): Mention decompressing the
installation image.

gnu: ldc: Add missing patches.

This is a followup to commit 2429dde57d8461cc8e51dbe6c9d47d795fe6fc9a.

* gnu/packages/patches/ldc-1.1.0-disable-dmd-tests.patch,
gnu/packages/patches/ldc-1.1.0-disable-phobos-tests.patch: New files.

doc: Fix networking instructions in "Installing GuixSD in a VM".

This is a followup to commit c8b543741f422ecf41e7635c6a1c40b3bd55947a.

* doc/guix.texi (Installing GuixSD in a VM): Fix typo.

gnu: assword: Wrap with the GObject typelib of GTK+.

Fixes <https://debbugs.gnu.org/25457>.

* gnu/packages/password-utils.scm (assword)[inputs]: Add 'gtk+'.
[arguments]: Add 'wrap-assword' phase.