branch master updated (1d19bc1 -> d23c20f)

[Ludovic Courtès]

civodul pushed a change to branch master
in repository guix.

      from  1d19bc1   gnu: elogind: Provide the file name of 'halt' and 
'reboot'.
       new  c6f8e9d   guix archive: Add '--extract'.
       new  ea0c6e0   substitute: Expose narinfo access.
       new  d23c20f   Add 'guix challenge'.

The 3 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "adds" were already present in the repository and have only
been added to this reference.


Summary of changes:
 Makefile.am                 |    2 +
 doc.am                      |    1 +
 doc/contributing.texi       |   11 ++
 doc/guix.texi               |  154 +++++++++++++++++++++++++++-
 guix/scripts/archive.scm    |   10 ++
 guix/scripts/challenge.scm  |  244 +++++++++++++++++++++++++++++++++++++++++++
 guix/scripts/substitute.scm |   40 +++++++-
 po/guix/POTFILES.in         |    1 +
 tests/challenge.scm         |  114 ++++++++++++++++++++
 tests/guix-archive.sh       |   15 +++-
 10 files changed, 585 insertions(+), 7 deletions(-)
 create mode 100644 guix/scripts/challenge.scm
 create mode 100644 tests/challenge.scm