guix build: Add '--log-file'.

* guix/scripts/build.scm (show-help): Add '--log-file'.
  (%options): Likewise.
  (guix-build): Set %FILE-PORT-NAME-CANONICALIZATION.  Honor '--log-file'.
* tests/guix-build.sh: Add '--log-file' tests.
* doc/guix.texi (Invoking guix build): Document '--log-file'.

store: Add 'log-file' procedure.

* guix/store.scm (log-file): New procedure.
* tests/store.scm ("log-file, derivation", "log-file, output file
  name"): New tests.

gnu: Add phonon.

* gnu/packages/kde.scm (phonon): New variable.

gnu: qt: Enable SIMD instructions available on x86_64.

* gnu/packages/qt.scm (qt, qt-4): Enable mmx, 3dnow, sse and sse2 on x86_64.

gnu: Add GVPE.

* gnu/packages/gvpe.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu: Add GNU complexity.

* gnu/packages/complexity.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

nls: Add Serbian translation.

* po/sr.po: New file.
* po/LINGUAS: Add 'sr'.

substitute-binary: Increase lookup concurrency to reduce latency.

* guix/scripts/substitute-binary.scm (%lookup-threads): New variable.
  (guix-substitute-binary): Use 'n-par-map' instead of 'par-map' for
  batch 'lookup-narinfo' calls.

gnu: lapack: Use origin snippet to remove the non-free files.

* gnu/packages/maths.scm (lapack): Add 'snippet' field with contents of
  former 'remove-non-free-files' phase; remove that phase.

packages: Add a 'snippet' field to <origin>.

* guix/packages.scm (<origin>): Add 'snippet', 'modules', and
  'imported-modules' fields.
  (patch-and-repack): Make 'inputs' a keyword parameter.  Add 'snippet',
  'modules', and 'imported-modules' parameters.  Accept SOURCE as a raw
  file name.  Insert SNIPPET in BUILDER.  Pass IMPORTED-MODULES to
  'build-expression->derivation'.
  (package-source-derivation): Pass the extra arguments to
  'patch-and-repack'.
* tests/packages.scm ("package-source-derivation, snippet"): New test.
* doc/guix.texi (Defining Packages): Mention the 'patches' and 'snippet'
  fields.
  (Invoking guix build): Tell that --source has patches and snippets
  applied.
  (Software Freedom): Mention packages that contain non-free code.

doc: Document current security issue with substitutes.

Suggested by Mark H. Weaver <mhw@netris.org>.

* doc/guix.texi (Features): Add note about unauthenticated binaries.

doc: Improve documentation of '--no-substitutes'.

Suggested by Mark H. Weaver <mhw@netris.org>.

* doc/guix.texi (Invoking guix package): Spell out the --no-substitutes
  documentation.
  (Invoking guix build): Use the more complete --no-substitutes
  documentation.
  (Invoking guix-daemon): Explain the interaction with what clients ask
  for.

gnu: Add LAPACK.

* gnu/packages/maths.scm (lapack): New variable.

Add indentation rule for 'origin'.

tests: Fix max-silent-time test.

* tests/derivations.scm ("build-expression->derivation and
  max-silent-time"): Use STORE instead of %STORE.  Change BUILDER to
  succeed by default.  Return #f when no exception is raised.

tests: Add the builder as an input to raw derivations.

* tests/derivations.scm ("build derivation with 1 source",
  "derivation with local file as input",
  "derivation with a fixed-output input",
  "multiple-output derivation",
  "multiple-output derivation, non-alphabetic order",
  "user of multiple-output derivation"): Add %BASH as an input, needed
  in chroot builds.

gnu: recutils: Upgrade to 1.6.

* gnu/packages/recutils.scm (recutils): Upgrade to 1.6.  Add cURL and
  libgcrypt as inputs.

ui: Make '--version' output GCS-compliant.

* guix/ui.scm (show-version-and-exit): Display copyright year, license,
  and LACK OF WARRANTY.

gnu: cmake: Bump to 2.8.12

* gnu/packages/cmake.scm: bump to 2.8.12

doc: Document the syntax of the '--remove' argument.

* doc/guix.texi (Invoking guix package): Document the syntax of
  '--remove' patterns.