branch master updated (4520354 -> 21461f2)

[Ludovic Courtès]

civodul pushed a change to branch master
in repository guix.

      from  4520354   gnu: Add python-pyzmq.
       new  ea98270   syscalls: Add 'restart-on-EINTR'.
       new  60a56db   services: swap: Use 'restart-on-EINTR'.
       new  6fb4fb7   gnu: guix: Update development snapshot.
       new  99bd74d   doc: Make '--manifest' more visible.
       new  a2bf490   doc: Add a cross-reference to "origin Reference".
       new  21461f2   doc: More cross-references.

The 6 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                       |   63 +++++++++++++++++++++++++---------
 gnu/packages/package-management.scm |    4 +-
 gnu/services/base.scm               |    4 +-
 guix/build/syscalls.scm             |   16 ++++++++-
 4 files changed, 65 insertions(+), 22 deletions(-)