* modules/past/packages/python27.scm (python2-pillow)[arguments]: Use
python-2.

* modules/past/packages/python27.scm (python2-pillow): New variable.

* modules/past/packages/bioinformatics.scm: Use (past packages
python27).

Notably, this adds python2-numpy.

* modules/past/packages/python27.scm: New file.

* modules/past/packages/python.scm (python-3.8): New variable.
* modules/past/patches/python-3.8-arm-alignment.patch,
modules/past/patches/python-3.8-deterministic-build-info.patch,
modules/past/patches/python-3.8-fix-tests.patch,
modules/past/patches/python-3.8-fix-tests2.patch,
modules/past/patches/python-3.8-hurd-configure.patch,
modules/past/patches/python-3.8-search-paths.patch: New files.

This works around the lack of a fallback for the Subversion checkout of
GTNETS-SOURCE and also for fixed-output derivations in general.

* modules/past/packages/simgrid.scm (gtnets-zipball)
(gtnets-patch-tarball): Turn into origins, preserving sha256.

* modules/past/packages/maths.scm (lrslib-4.0)[arguments]: Add
'set-c-flags' phase.

* modules/past/packages/statistics.scm (r-minimal-2)[arguments]: Pass
CFLAGS and FFLAGS.

* modules/past/packages/simgrid.scm (simgrid-3.3)[arguments]: Pass
  #:configure-flags.

* modules/past/packages/python.scm (python24-pyx)[native-inputs]: Use
'texlive-union'.

* modules/past/packages/boost.scm (boost-1.68)[native-inputs]: Replace
'python@2' with 'python2@2.7'.
(boost-1.58)[native-inputs]: Same.

* modules/past/packages/assembly.scm,
modules/past/packages/bioinformatics.scm,
modules/past/packages/boost.scm,
modules/past/packages/maths.scm,
modules/past/packages/python.scm,
modules/past/packages/qt.scm: Replace (guix) import with the modules
actually used in the package module.

[arguments]: Remove 'add-install-to-pythonpath, 'sanity-check phases.
Replace add-installed-pythonpath with snippet setting PYTHONPATH. Remove
trailing #t from phases.

* modules/past/packages/python.scm (python-2.4)[arguments]: Rewrite
custom 'delete-failing-tests, 'find-netinet-in-h phases.

* modules/past/packages/python.scm (python-2.4)[source]: Remove trailing
  #t from snippet.
[arguments]: Remove trailing #t from phases. Replace inherited phases
'remove-tests, 'install-sitecustomize.py, 'move-tk-inter, 'move-idle.

* modules/past/packages/graphviz.scm (graphviz-2.26)[arguments]: Avoid
referring to (package-arguments graphviz), which now uses gexps.

* modules/past/packages/boost.scm (boost-1.68)[source]: Fix reference to
"boost-fix-icu-build.patch" (previously we were picking up the one from
the 'guix' channel, which no longer exists.)

* modules/past/packages/graphviz.scm (graphviz-2.26)[properties]: Make
'release-date' a key/value pair.
* modules/past/packages/python.scm (python-2.4)[properties]: Likewise.
(python24-argparse)[properties]: Likewise.
(python24-dateutil)[properties]: Likewise.
(python24-nose)[properties]: Likewise.
(python24-numarray)[properties]: Likewise.
(python24-numpy-1.0)[properties]: Likewise.
(python24-numpy-1.1)[properties]: Likewise.
(python24-numpy-1.2)[properties]: Likewise.
(python24-pyx)[properties]: Likewise.
(python24-pyxlwriter)[properties]: Likewise.
(python24-setuptools)[properties]: Likewise.
(python24-matplotlib)[properties]: Likewise.
(python24-py)[properties]: Likewise.
(python24-pytest)[properties]: Likewise.
(python24-rpy2)[properties]: Likewise.
(python24-six)[properties]: Likewise.
* modules/past/packages/statistics.scm (r-with-tests-2)[properties]: Likewise.
* modules/past/packages/web.scm (httpd-2.2)[properties]: Likewise.

* modules/past/packages/boost.scm (boost-1.68): New variable.
* modules/past/patches/boost-fix-icu-build.patch: New file.

* modules/past/packages/statistics.scm (r-minimal-3.6.3): New variable.

* modules/past/packages/statistics.scm (r-minimal-3.4.2): New variable.

* modules/past/packages/statistics.scm (r-minimal-3.3.3): New variable.

* modules/past/packages/statistics.scm (r-minimal-3.3.2): New variable.

* modules/past/packages/statistics.scm (r-minimal-3.3.1): New variable.

* modules/past/packages/perl.scm (perl-5.14)[native-inputs]: Add gcc-7.

* modules/past/packages/bioinformatics.scm: New file.

* modules/past/packages/tls.scm (openssl-1.0): New variable.
* modules/past/packages/python.scm, modules/past/packages/web.scm:
Import module.
* modules/past/patches/openssl-c-rehash-in.patch,
modules/past/patches/openssl-runpath.patch: New files.

* modules/past/packages/perl.scm (perl-5.24): New variable.
* modules/past/patches/perl-5.24-autosplit-default-time.patch,
modules/past/patches/perl-5.24-deterministic-ordering.patch,
modules/past/patches/perl-5.24-no-sys-dirs.patch,
modules/past/patches/perl-5.24-reproducible-build-date.patch: New files.

* README.md: Link to guix.bordeaux.inria.fr.

* README.md (Guix-Past): Link to Cuirass badge.

* modules/past/packages/qt.scm: Load (gnu packages) rather than (gnu).
Use core 'delete' instead of (srfi srfi-1), reverting
f465aacd.

* modules/past/packages/qt.scm: Use prefixed srfi-1 delete to avoid
conflict with delete from (gnu) and delete from (guile.

* modules/past/packages/qt.scm,
modules/past/patches/qt4-ldflags.patch: New files.

Fixes <https://bugs.gnu.org/45173>.

* modules/past/packages/simgrid.scm: Use (gnu packages) instead
of (gnu) so we don't pull all of (gnu services ...) etc.

* modules/past/packages/python.scm (python24-rpy2): New variable.

* modules/past/packages/statistics.scm (r-2-survival): New variable.

* modules/past/packages/statistics.scm (r-2-matrix): New variable.

* modules/past/packages/statistics.scm (r-2-lattice): New variable.

* modules/past/packages/statistics.scm (r-minimal-2): New variable.

* modules/past/packages/statistics.scm(r-with-tests-2): New variable.