tests: Make sure substitutes are usable when we need them.

* tests/derivations.scm ("derivation-prerequisites-to-build and
  substitutes"): Add call to 'set-build-options'.

authenticate: Support reading the hash or key from stdin.

* guix/scripts/authenticate.scm (guix-authenticate): Add clauses
  for ("rsautl" "-sign" "-inkey" key) and ("rsautl" "-verify" "-inkey" _
  "-pubin").
* tests/guix-authenticate.sh (hash): Add test using -sign and -verify in
  a pipeline.

authenticate: Move actual work to separate procedures.

* guix/scripts/authenticate.scm (read-canonical-sexp): Change to expect
  a port instead of a file name.
  (read-hash-data): Likewise.
  (sign-with-key, validate-signature): New procedures.
  (guix-authenticate): Rewrite in terms of these two procedures.

Update 'nix-upstream' sub-module.

* nix-upstream: Update.

utils: Add 'decompressed-port' and 'compressed-port'.

* guix/utils.scm (decompressed-port, compressed-port): New procedures.
* guix/scripts/substitute-binary.scm (decompressed-port): Remove.
  (guix-substitute-binary): Pass a symbol or #f as the first argument to
  'decompress-port'.
* tests/utils.scm ("compressed-port, decompressed-port, non-file"): New
  test.

utils: 'filtered-port' doesn't leave dangling processes behind.

* guix/utils.scm (filtered-port): Make sure the 'execl' child process
  always exits, and does (primitive-_exit 1) upon execution failure.
  Use 'primitive-_exit' in the 'dump-port' child process.
* tests/utils.scm ("filtered-port, does not exist"): New test.

licenses: Fix Nixpkgs license URL.

* guix/licenses.scm: Fix Nixpkgs URL in comment.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: Provide single-precision fftw library for pulseaudio

* gnu/packages/algebra.scm (fftwf): New variable
* gnu/packages/pulseaudio.scm (pulseaudio): Use it

gnu: cmake: Install man pages and docs in share/{man,doc}.

* gnu/packages/cmake.scm (cmake): Pass --mandir and --docdir to configure.
  Rewrite the code that selects the first two components of the version.

gnu: flac: Install man pages in share/man.

* gnu/packages/xiph.scm (flac): Add --mandir configure flag.

gnu: libvorbis: disable parallel tests

* gnu/packages/xiph.scm (libvorbis): disable parallel tests

gnu: openssh: Upgrade to 6.6p1.

* gnu/packages/ssh.scm (openssh): Upgrade to 6.6p1.

daemon: Really override the substituters setting.

Reported by Andreas Enge <andreas@enge.fr>:
<https://lists.gnu.org/archive/html/guix-devel/2014-03/msg00211.html>.

* nix/nix-daemon/guix-daemon.cc (main): Set the 'NIX_SUBSTITUTERS'
  env. var.  Leave 'settings.substituters' unchanged.

pk-crypto: Don't use Ed25519 when libgcrypt is older than 1.6.0.

* guix/pk-crypto.scm (gcrypt-version): New procedure.
* guix/scripts/archive.scm (%key-generation-parameters): New variable.
  (%options) <generate-key>: Use it.
* tests/pk-crypto.scm ("sign + verify, Ed25519"): Skip if using gcrypt < 1.6.0.

gnu: tzdata: Upgrade to 2014a.

gnu: lynx: Upgrade to 2.8.8rel.2.

* gnu/packages/lynx.scm (lynx): Upgrade to 2.8.8rel.2.

gnu: bc: Install docs in share/man and share/info.

* gnu/packages/algebra.scm (bc): Pass --mandir and --infodir to configure.

gnu: unzip: Install man pages in share/man.

* gnu/packages/zip.scm (unzip): Substitute /share/man/ for /man/ in Makefile.

gnu: screen: Install docs in share/man and share/info.

* gnu/packages/screen.scm (screen): Add --mandir and --infodir
  configure flags.

gnu: netcat: Install docs in share/man and share/info.

* gnu/packages/admin.scm (netcat): Add --mandir and --infodir
  configure flags.