branch master updated (1c65314 -> 16eb115)

[Ludovic Courtès]

civodul pushed a change to branch master
in repository guix.

      from  1c65314   gnu: Add matplotlib.
       new  9cb426b   Revert "system: Add a 'needed-for-boot?' field to 
'mapped-device'."
       new  5f86a66   doc: Explain that 'file-system' must refer to mapped 
devices by file name.
       new  6efc160   daemon: Default to '--cores=0'.
       new  16eb115   guix: scripts: Add GUIX_BUILD_OPTIONS environment 
handling.

The 4 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                 |   43 ++++++++++++++++++++++++++++------------
 gnu/system.scm                |   17 ++++++++++++---
 gnu/system/file-systems.scm   |    5 +---
 guix/scripts/archive.scm      |    3 +-
 guix/scripts/build.scm        |    3 +-
 guix/scripts/environment.scm  |    3 +-
 guix/scripts/package.scm      |    3 +-
 guix/scripts/system.scm       |    3 +-
 guix/ui.scm                   |    5 ++++
 guix/utils.scm                |   10 +++++++++
 nix/nix-daemon/guix-daemon.cc |    3 ++
 test-env.in                   |    4 +-
 tests/guix-build.sh           |   10 +++++++++
 13 files changed, 84 insertions(+), 28 deletions(-)