gnu: Add python-configargparse. * gnu/packages/python.scm (python-configargparse, python2-configargparse): New variables.
gnu: Add python2-pythondialog. * gnu/packages/python.scm (python2-pythondialog): New variable.
gnu: Add dialog. * gnu/packages/python.scm (dialog): New variable.
gnu: Add python-configobj. * gnu/packages/python.scm (python-configobj, python2-configobj): New variables. * gnu/packages/patches/python-configobj-setuptools.patch: New file. * gnu-system.am (dist_patch_DATA): Add it.
gnu: Add python-werkzeug. * gnu/packages/python.scm (python-werkzeug, python2-werkzeug): New variables.
gnu: Add python-pyrfc3339. * gnu/packages/python.scm (python-pyrfc3339, python2-pyrfc3339): New variables.
gnu: Add python-zope-component. * gnu/packages/python.scm (python-zope-component, python2-zope-component): New variables.
gnu: Add python-zope-security. * gnu/packages/python.scm (python-zope-security, python2-zope-security): New variables.
gnu: Add python-zope-location. * gnu/packages/python.scm (python-zope-location, python2-zope-location): New variables.
gnu: Add python-zope-proxy. * gnu/packages/python.scm (python-zope-proxy, python2-zope-proxy): New variables.
gnu: Add python-zope-configuration. * gnu/packages/python.scm (python-zope-configuration, python2-zope-configuration): New variables.
gnu: Add python-zope-schema. * gnu/packages/python.scm (python-zope-schema, python2-zope-schema): New variables.
gnu: Add python-zope-i18nmessageid. * gnu/packages/python.scm (python-zope-i18nmessageid, python2-zope-i18nmessageid): New variables.
gnu: Add python-zope-testrunner. * gnu/packages/python.scm (python-zope-testrunner, python2-zope-testrunner): New variables.
gnu: Add python-zope-testing. * gnu/packages/python.scm (python-zope-testing, python2-zope-testing): New variables.
gnu: Add python-zope-exceptions. * gnu/packages/python.scm (python-zope-exceptions, python2-zope-exceptions): New variables.
gnu: Add python-zope-interface. * gnu/packages/python.scm (python-zope-interface, python2-zope-interface): New variables.
gnu: Add python-zope-event. * gnu/packages/python.scm (python-zope-event, python2-zope-event): New variables.
system: Add /etc/environment. * gnu/system.scm: (operating-system-environment-variables): New procedure. Adapted and moved environment variables from /etc/profile. (operating-system-etc-service): Adjust accordingly. (essential-services): Add an instance of SESSION-ENVIRONMENT-SERVICE-TYPE.
system: pam: Honor /etc/environment. * gnu/system/pam.scm (unix-pam-service): Add pam_env module to the session group.