gnu: python-pyflow: Rename to python2-pyflow.

The package was never compatible with Python 3. Not adding a deprecated
package variant, because going from Python 3 to Python 2 is a breaking
change and it’s unlikely anyone ever used the package anyway (it was
likely broken).

* gnu/packages/python-science.scm (python-pyflow): Move…
(python2-pyflow): …here.
[arguments]: Use Python 2.

gnu: python-flask-restful: Rewrite import.

It seems a function inside python-flask moved to a different module.

* gnu/packages/python-web.scm (python-flask-restful)[arguments]: Add
phase rewriting imports from flask.helpers to flask.scaffold.

gnu: Add js-mathjax-3.

* gnu/packages/javascript.scm (js-mathjax-3): New variable.
* gnu/packages/patches/mathjax-disable-webpack.patch,
gnu/packages/patches/mathjax-no-a11y.patch: New patches.
* gnu/local.mk (dist_patch_DATA): Register them.

gnu: Add todoman.

* gnu/packages/task-management.scm (todoman): New variable.

gnu: Replace JUPYTER_CONFIG_DIR with JUPYTER_CONFIG_PATH.

Judging by the documentation
(https://jupyter.readthedocs.io/en/latest/use/jupyter-directories.html)
_DIR can only be a single value, whereas _PATH supports :-delimited
values and extends _DIR with extra directories.

* gnu/packages/python-xyz.scm (python-jupyter-core)[native-search-paths]:
Replace _DIR with _PATH.
(python-nbconvert)[arguments]: Unset JUPYTER_CONFIG_PATH during tests.
(python-notebook)[arguments]: Dito.

gnu: python-sanic: Update to 20.12.4.

* gnu/packages/python-web.scm (python-sanic)[version]: Update to 20.12.4.
[arguments]: Skip more failing tests.

gnu: Add qdirstat.

* gnu/packages/disk.scm (qdirstat): New variable

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: gqrx: Update to 2.15.

* gnu/packages/radio.scm (gqrx): Update to 2.15.
[source]: Update source URI.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: nss-certs: Avoid top-level reference to NSS.

This is the only hammer I know for dealing with module cycles and
effectively fixes, for example, ‘guix show nss’ today.

It's also a very poor solution.

* gnu/packages/certs.scm (nss-certs)[version, source]: Copy verbatim
from the nss package rather than referring to it at the top level.

Reported by several users of #guix.

gnu: xdot: Build with harfbuzz.

This fixes a crash when launching xdot.

* gnu/packages/graphviz.scm (xdot)[inputs]: Add harfbuzz.
[arguments]: Add harfbuzz to the GI_TYPELIB_PATH wrapper in the 'wrap' phase.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: polari: Use polari command to launch Polari.

The rationale for patching the Exec line is similar to what is done for
gnome-weather.

* gnu/packages/gnome.scm (polari)[#:phases]: Add ‘fix-desktop-file’ phase.

gnu: gnome-shell-extensions: Update to 41.0.

* gnu/packages/gnome.scm (gnome-shell-extensions): Update to 41.0.

gnu: gnome-shell-extension-dash-to-panel: Update to 45.

* gnu/packages/gnome-xyz.scm (gnome-shell-extension-dash-to-panel): Update to 45.

gnu: gnome-shell-extension-dash-to-dock: Update to 71.

* gnu/packages/gnome-xyz.scm (gnome-shell-extension-dash-to-dock): Update to
71.
[native-inputs]: Add sassc.

gnu: polari: Update to 40.1.

* gnu/packages/gnome.scm (polari): Update to 40.1.
[source]: Use ‘version-major’ for directory.
[arguments]: Use meson-0.59.
[inputs]: Use gtk and libsoup-minimal-2.

gnu: gitg: Fix compilation.

* gnu/packages/gnome.scm (gitg)[#:meson]: Use meson-0.59.
[#:phases] Add ‘harden’ phase to fix test failures.
[inputs]: Use libsoup-minimal-2.

gnu: ungoogled-chromium: Update to 96.0.4664.110-1.

* gnu/packages/chromium.scm (%chromium-version): Set to 96.0.4664.110-1.
(%ungoogled-origin, ungoogled-chromium): Update hashes.

gnu: qemu: Adjust style.

* gnu/packages/virtualization.scm (qemu)[arguments]: Use SEARCH-INPUT-FILE
instead of WHICH.
[native-inputs]: Remove labels.
[inputs]: Likewise.  Add BASH-MINIMAL and remove duplicate ATTR.

gnu: liferea: Use the simplified input style.

* gnu/packages/syndication.scm (liferea)[native-inputs]: Simplify.

gnu: liferea: Build with libsoup 2.

Reported by Luis Felipe on #guix.

* gnu/packages/syndication.scm (liferea)[inputs]: Use LIBSOUP-MINIMAL-2
and WEBKITGTK-WITH-LIBSOUP2.