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.

guix package: Show the output name of what's being removed.

* guix/scripts/package.scm (show-what-to-remove/install): Show the
  output name of packages being removed.

guix package: Fix indentation of "will be removed" messages.

* guix/scripts/package.scm (show-what-to-remove/install): Remove extra
  indentation from the removal sentences.

guix package: Allow removal of a specific package output.

Fixes <http://bugs.gnu.org/15756>.

* guix/profiles.scm (<manifest-pattern>): New record type.
  (remove-manifest-entry): Remove.
  (entry-predicate, manifest-matching-entries): New procedures.
  (manifest-remove): Accept a list of <manifest-pattern>.
  (manifest-installed?): Replace 'name' parameter by 'pattern', a
  <manifest-pattern>.
* guix/scripts/package.scm (options->removable): Return a list of
  <manifest-pattern>.
  (guix-package)[process-action]: Use 'manifest-matching-entries' to
  compute the list of packages to remove.
* tests/profiles.scm: New file.
* Makefile.am (SCM_TESTS): Add it.

guix package: Separate '--remove' option processing.

* guix/scripts/package.scm (options->removable): New procedure.
  (guix-package)[process-actions]: Use it.  Rename 'remove*' to 'remove'
  and 'install*' to 'install'.

ui: Factorize package specification parsing.

* guix/ui.scm (package-specification->name+version+output): New
  procedure.
* guix/scripts/package.scm (specification->package+output): Use it.
* tests/ui.scm ("package-specification->name+version+output"): New test.

Add (guix profiles).

* guix/scripts/package.scm (show-what-to-remove/install): New procedure,
  moved from...
  (guix-package): ... here.
  (<manifest>, make-manifest, <manifest-entry>,
  profile-manifest, manifest->sexp, sexp->manifest, read-manifest,
  write-manifest, remove-manifest-entry, manifest-remove,
  manifest-installed?, manifest=?, profile-regexp, generation-numbers,
  previous-generation-number, profile-derivation, generation-number,
  generation-file-name, generation-time, lower-input): Move to...
* guix/profiles.scm: ... here.  New file.
* Makefile.am (MODULES): Add it.