gnu: Add smlnj.

* gnu/packages/sml.scm (smlnj): New variable.

Co-authored-by: Brett Gilio <brettg@gnu.org>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

environment: Suggestion code gracefully handles empty "/bin" directories.

* guix/scripts/environment.scm (suggest-command-name): Handle the case
where 'scandir' returns #f.

shell: When using '-D -f', '-D' has no effect on remaining packages.

Fixes <https://issues.guix.gnu.org/52093>.
Reported by Konrad Hinsen <konrad.hinsen@fastmail.net>.

* guix/scripts/shell.scm (%options): In "--file" handler, add call to
'ensure-ad-hoc'.
* tests/guix-shell.sh: Add test.

shell: Fix '--file' description in '--help' output.

Reported by pinoaffe on #guix.

* guix/scripts/shell.scm (show-help): Fix '--file' description.

gnu: ocaml-ppx-expect: Update to 0.14.2.

* gnu/packages/ocaml.scm (ocaml-ppx-expect): Update to 0.14.2.

gnu: ocaml-migrate-parsetree: Update to 2.3.0.

* gnu/packages/ocaml.scm (ocaml-migrate-parsetree): Update to 2.3.0.

gnu: ocamlformat: Update to 0.20.0.

* gnu/packages/ocaml.scm (ocamlformat): Update to 0.20.0.

gnu: Add ocaml-either.

* gnu/packages/ocaml.scm (ocaml-either): New variable.

gnu: ocaml-fix: Update to 20211125.

gnu: Add ccwl.

* gnu/packages/bioinformatics.scm (ccwl): New variable.

gnu: notmuch: Update to 0.34.2.

* gnu/packages/mail.scm (notmuch): Update to 0.34.2.

gnu: emacs-which-key: Update to 3.5.4.

* gnu/packages/emacs-xyz.scm (emacs-which-key): Update to 3.5.4.

gnu: emacs-ebib: Update to 2.34.

* gnu/packages/emacs-xyz.scm (emacs-ebib): Update to 2.34.

gnu: gajim: Fix typo.

* gnu/packages/messaging.scm (gajim)[arguments]: Add missing brackets.
All typos are my own.

gnu: gajim: Restore 'disable-failing-tests phase.

Gajim consistently builds on my machines & bayfront, whilst
raghavgururajan reports the exact same derivation consistently failing
with the commented error.  Odd.

* gnu/packages/messaging.scm (gajim)[arguments]: Restore the old
'disable-failing-tests phase.

gnu: gpxsee: Update to 10.0.

* gnu/packages/gps.scm (gpxsee): Update to 10.0.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>

gnu: nnn: Update to 4.4.

* gnu/packages/admin.scm (nnn): Update to 4.4.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>

gnu: emacs-parsebib: Update to 3.1.

* gnu/packages/emacs-xyz.scm (emacs-parsebib): Update to 3.1.

gnu: rosegarden: Update to 21.12.

* gnu/packages/music.scm (rosegarden): Update to 21.12.

gnu: pyzo: Update to 4.11.7.

* gnu/packages/python-xyz.scm (pyzo): Update to 4.11.7.