branch master updated (451b5c5 -> 59a4dd5)

[Ludovic Courtès]

civodul pushed a change to branch master
in repository guix.

      from  451b5c5   gnu: vigra: Update to a development snapshot.
       new  dd78e90   store: 'references/substitutes' correctly handles the 
order of substitutes.
       new  59a4dd5   doc: Explain how to check whether security updates are 
used.

The 2 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:
 doc/guix.texi  |   41 +++++++++++++++++++++++++++++++++++++++++
 guix/store.scm |   28 ++++++++++++++++++----------
 2 files changed, 59 insertions(+), 10 deletions(-)