derivations: Move grafts to (guix grafts).

* guix/derivations.scm (<graft>, graft-derivation, %graft?)
(set-grafting): Move to...
* guix/grafts.scm: ... here.  New file.
* guix/gexp.scm, guix/packages.scm, tests/packages.scm,
guix/scripts/build.scm: Use it.
* Makefile.am (MODULES): Add it.
(SCM_TESTS): Add tests/grafts.scm.
* tests/derivations.scm ("graft-derivation"): Move to...
* tests/grafts.scm: ... here.  New file.

Add (guix build bournish) and use it in the initrd.

* guix/build/bournish.scm: New file.
* Makefile.am (MODULES): Add it.
* gnu/system/linux-initrd.scm (base-initrd): Add (guix build bournish)
and use it.

gnu: Add linux-libre-4.1.

* gnu/packages/linux-libre-4.1-i686.conf,
  gnu/packages/linux-libre-4.1-x86_64.conf: New files.
* Makefile.am (KCONFIGS): Add them.
* gnu/packages/linux.scm (linux-libre-4.1): New variable.

guix build: Transformations operate on single objects.

* guix/scripts/build.scm (transform-package-source): Return a procedure
that expects a single object rather than a list of packages.
(options->transformation): Rewrite to precompute the list of applicable
transformations and to return a procedure that expects a single object
rather than a list of objects.
(options->derivations): Adjust accordingly.
* tests/scripts-build.scm: New file.
* Makefile.am (SCM_TESTS): Add it.

build: Use 'GEN' and 'at' silent rules.

* daemon.am (nix/libstore/schema.sql.hh, etc/guix-daemon.service)
(etc/guix-daemon.conf): Use $(AM_V_GEN).
* doc.am (doc/os-config-%.texi, .png.eps): Likewise.
* Makefile.am (guix-binary.%.tar.xz, gen-ChangeLog, gen-AUTHORS):
Likewise.
(assert-binaries-available, assert-final-inputs-self-contained)
(assert-no-store-file-names, sync-descriptions): Use $(AM_V_at).

build: Add 'HELP2MAN' silent rule.

* Makefile.am (AM_V_HELP2MAN, AM_V_HELP2MAN_, AM_V_HELP2MAN_0): New
variables.
* doc.am (subcommand-manual-target, doc/guix.1, doc/guix-daemon.1): Use
$(AM_V_HELP2MAN).

build: Add 'EMACS' silent rule.

* Makefile.am (AM_V_EMACS, AM_V_EMACS_, AM_V_EMACS_0): New variables.
* emacs.am [HAVE_EMACS] ($(AUTOLOADS)): Use $(AM_V_EMACS).

build: Add 'DOT' silent rule.

* Makefile.am (AM_V_DOT, AM_V_DOT_, AM_V_DOT_0): New variables.
* doc.am (.dot.png, .dot.pdf, .dot.eps): Use $(AM_V_DOT).

build: Add 'DL' silent rule.

* Makefile.am (AM_V_DL, AM_V_DL_, AM_V_DL_0): New variables.
* gnu-system.am (gnu/packages/bootstrap/x86_64-linux/guile-2.0.9.tar.xz)
(gnu/packages/bootstrap/i686-linux/guile-2.0.9.tar.xz)
(gnu/packages/bootstrap/armhf-linux/guile-2.0.11.tar.xz)
(gnu/packages/bootstrap/mips64el-linux/guile-2.0.9.tar.xz): Use $(AM_V_DL).
* build-aux/download.scm: Print a line break between target and origin.

Merge branch 'master' into core-updates

system: grub: Search root device by label or UUID if possible.

Fixes <http://bugs.gnu.org/22281>.
Reported by Christopher Allan Webber <cwebber@dustycloud.org>.

* gnu/system/grub.scm (eye-candy): Add 'root-fs' parameter.  Replace
'search --file' command in the output with whatever 'grub-root-search'
returns.
(grub-root-search): New procedure.
(grub-configuration-file): Add 'store-fs' parameter.  Use
'grub-root-search' instead of hard-coded 'search --file' commands.
* gnu/system.scm (store-file-system,
operating-system-store-file-system): New procedures.
(operating-system-grub.cfg): Use it, and adjust call to
'grub-configuration-file'.
* tests/system.scm: New file.
* Makefile.am (SCM_TESTS): Add it.

tests: Move beatify-description tests to import-tests.

Fixes <http://bugs.gnu.org/22391>.

* tests/cran.scm (beautify-description: use double spacing,
beautify-description: transform fragment into sentence). Move
from here ...
* tests/import-utils.scm: ... to here. New file.
* Makefile.am (SCM_TESTS): Add import-utils.

Merge branch 'master' into core-updates

build: Speed up .go compilation.

* build-aux/compile-all.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
(%.go, make-go): New rules.

Merge branch 'master' into core-updates

build: 'make check' errors out if file name limits would be hit.

* Makefile.am (SCM_TESTS, SH_TESTS, TESTS, AM_TESTS_ENVIRONMENT)
(SCM_LOG_COMPILER, SH_LOG_COMPILER, AM_SCM_LOG_FLAGS)
(AM_SH_LOG_FLAGS): Move within 'if CAN_RUN_TESTS'.
(check-local) [!CAN_RUN_TESTS]: New target.
* daemon.am (AM_TESTS_ENVIRONMENT, TESTS): Ditto.
* m4/guix.m4 (GUIX_CHECK_FILE_NAME_LIMITS): Add parameter and set it.

Merge branch 'master' into core-updates

Add "Contributor Covenant".

* CODE-OF-CONDUCT: New file, adapted from
  <http://contributor-covenant.org/version/1/3/0/code_of_conduct.txt>.
* doc/contributing.texi (Contributing): Mention it.
* Makefile.am (EXTRA_DIST): Add it.

gnu-maintenance: Add tests for 'release-file?'.

* tests/gnu-maintenance.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
* guix/gnu-maintenance.scm (release-file?): Export.

Add (guix cve).

* guix/cve.scm, tests/cve-sample.xml, tests/cve.scm: New files.
* Makefile.am (MODULES): Add guix/cve.scm.
(SCM_TESTS): Add tests/cve.scm.
(EXTRA_DIST): Add tests/cve-sample.scm.