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.

offload: Send build logs to file descriptor 4.

* guix/scripts/offload.scm (with-error-to-port): New macro.
  (remote-pipe): Add #:error-port parameter.  Use 'with-error-to-port'
  around 'open-pipe*' call.
  (build-log-port): New procedure.
  (offload): Change #:log-port to default to (build-log-port).  Call
  'remote-pipe' with #:error-port LOG-PORT.

substitute-binary: Quietly handle 404s when fetching narinfos.

* guix/scripts/substitute-binary.scm (fetch): Add #:quiet-404?
  parameter.  Upon &http-get-error, re-raise C if the QUIET-404? is
  true and the code is 404.
  (fetch-narinfo): Pass #:quiet-404? #t.

gnu: xterm: Upgrade to 303.

* gnu/packages/xorg.scm (xterm): Upgrade to 303.

pk-crypto: Use RFC6979 when signing with an ECC or DSA key.

* guix/pk-crypto.scm (bytevector->hash-data): Add #:key-type parameter.
  Use the 'pkcs1' flag when KEY-TYPE is 'rsa', and 'rfc6979' when
  KEY-TYPE is 'ecc' or 'dsa'.
  (key-type): New procedure.
* guix/scripts/authenticate.scm (read-hash-data): Add 'key-type'
  parameter.  Pass it to 'bytevector->hash-data'.  Adjust caller
  accordingly.
* tests/pk-crypto.scm (%ecc-key-pair): New variable.
  ("key-type"): New test.
  ("sign + verify"): Pass #:key-type to 'bytevector->hash-data'.
  ("sign + verify, Ed25519"): New test.

gnu: imagemagick: Upgrade to 6.8.8-8.

* gnu/packages/imagemagick.scm (imagemagick): Upgrade to 6.8.8-8.

gnu: Add Window Maker.

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

tests: Test recovery from 'valid-path?' RPCs with an invalid parameter.

* tests/store.scm ("valid-path? live", "valid-path? false", "valid-path?
  error", "valid-path? recovery"): New tests.

Update 'nix-upstream' sub-module.

* nix-upstream: Update.

gnu: libxft: Propagate Freetype and Fontconfig.

* gnu/packages/xorg.scm (libxft): Move Freetype and Fontconfig from
  'inputs' to 'propagated-inputs'.

guix archive: Generate curve Ed25519 keys by default.

* guix/scripts/archive.scm (%options) <generate-key>: Default to curve
  Ed25519.  Suggested by Christian Grothoff <grothoff@in.tum.de>.

guix archive: Improve '--generate-key' error reporting.

* guix/scripts/archive.scm (%options) <generate-key>: Report the error
  source and string when 'string->canonical-sexp' fails.

build: Fix test failures due to the nix -> guix directory name change.

Reported by Nikita Karetnikov <nikita@karetnikov.org>
and Pierre-Antoine Rault <par@rigelk.eu>.

* test-env.in: Change 'NIX_LOG_DIR' in accordance with f5768af.
* tests/guix-register.sh: Likewise for 'NIX_LOG_DIR' and 'NIX_DB_DIR'.

gnu: luajit: Update to 2.0.3.

* gnu/packages/lua.scm (luajit): Update to 2.0.3.

gnu: python: Change URL to https.

* gnu/packages/python.scm (python-2, python)[source]: Change URL to
  https.  This makes sure GnuTLS is available in the derivation that
  downloads the source, which is required since http URLs get redirected
  to https anyway.  Reported by Manolis Ragkousis <manolis837@gmail.com>.

gnu: pulseaudio: Upgrade to 5.0.

* gnu/packages/pulseaudio.scm (pulseaudio): Upgrade to 5.0.
  Remove patches.
* gnu/packages/patches/pulseaudio-test-timeouts.patch,
  gnu/packages/patches/pulseaudio-volume-test.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.

gnu: fuse: Refer to the right 'mount' and 'umount' commands.

* gnu/packages/linux.scm (fuse)[inputs]: Change to...
  [native-inputs]: ... this.
  [arguments]: Add #:phases argument.

store: Add 'hash-part->path'.

* guix/store.scm (hash-part->path): New procedure.
* tests/store.scm ("hash-part->path"): New test.

offload: Fix 'choose-build-machine' for several machines.

* guix/scripts/offload.scm (choose-build-machine)[undecorate]: Turn into
  a two-argument procedure.