nls: Adjust to zsh.scm renaming.

* po/packages/POTFILES.in: Adjust to zsh.scm renaming in commit
7ccb874a299d6c6d86a3f1625a68c08ed20dbab6.

gnu: gcc: Reintroduce dependency on Texinfo.

This partly reverts 868c13c53a9788f8f27e77d8c8f99df14be512ba, which
introduced a regression whereby gcc@5 and gcc@6 would no longer contain
their Info manual.

* gnu/packages/gcc.scm (gcc-5)[native-inputs]: Remove.

gnu: curl: Replace with 7.50.1 [fixes CVE-2016-{3739,4802,5419,5420,5421].

* gnu/packages/curl.scm (curl)[replacement]: New field.
(curl-7.50.1): New variable.

gnu: zsh: Move to shells.scm.

* gnu/packages/zsh.scm (zsh): Move from here ...
* gnu/packages/shells.scm (zsh): ... to here.
* gnu/packages/zsh.scm: Delete file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Remove zsh.scm.

Update NEWS.

Merge branch 'core-updates'

Revert "Merge branch 'core-updates'"

This reverts commit 455859a50f88f625d13fc2f304111f02369b366b.

Revert "gnu: zsh: Move to shells.scm."

This reverts commit 12b63ab505f781e49b6e7dda2d9eca0aaf24eaf1.

Revert "Update NEWS."

This reverts commit 66edac525b7bb8ba29362c887450ff38c54da08d.

gnu: python-statsmodels: Fix tests.

* gnu/packages/statistics.scm (python-statsmodels): Add patch to fix tests.
(python2-statsmodels)[propagated-inputs]: Add python2-pytz.
* gnu/packages/patches/python-statsmodels-fix-tests.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu: gtk-doc: Disable parallel tests.

* gnu/packages/gtk.scm (gtk-doc)[arguments]: Disable parallel tests.

gnu: gtk-doc: Update to 1.25.

* gnu/packages/gtk.scm (gtk-doc): Update to 1.25.

gnu: python2-bz2file: Use python-2.

This is a followup to 124df723a0150e968910e34d5e94023b18901d0c.
Problem reported by Andreas Enge <andreas@enge.fr>.

* gnu/packages/python.scm (python2-bz2file)[arguments]: Use python-2.

gnu: qt: Update to 5.6.1-1.

* gnu/packages/qt.scm (qt): Update to 5.6.1-1.

Co-authored-by: David Craven <david@craven.ch>

gnu: qt: Use modify-phases syntax.

* gnu/packages/qt.scm (qt): Use modify-phases syntax.

gnu: qtbase: Modify .cmake files to enable modules in different packages.

* gnu/packages/qt.scm (qtbase)[arguments]: In the configure phase, modify
.cmake and .cmake.in files so that find_package honors CMAKE_PREFIX_PATH.

gnu: Add GCompris.

* gnu/packages/education.scm (gcompris): New variable.

Merge branch 'version-0.11.0'

gnu: Add discrover.

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

Rename references to (gnu packages tcsh).

* gnu/packages/algebra.scm, gnu/packages/boost.scm,
gnu/packages/maths.scm, gnu/packages/tex.scm, gnu/packages/vim.scm:
Change broken references to module (gnu packages tcsh) to (gnu packages
shells).