tests: Make sure child process of 'pivot-root' test exits.

* tests/syscalls.scm ("pivot-root"): Use 'test-equal'.  Wrap child body
in 'dynamic-wind'.

tests: Fix typo in 'with-graft' transformation test.

This is a followup to 645b9df858683dc05ffa04c9eb2fdc45ccef4a65.

* tests/scripts-build.scm ("options->transformation, with-graft"): Use
'with-graft', not 'with-input'.

Use (ice-9 binary-ports) instead of (rnrs io ports).

This reduces the closure of (guix ui) from 123 to 106 modules.

* guix/derivations.scm: Use (ice-9 binary-ports) instead of (rnrs io
ports).
(map-derivation)[substitute-file]: Use 'read-string' instead of
'get-string-all'.
* guix/ftp-client.scm: Likewise.
* guix/hash.scm: Likewise.
* guix/http-client.scm: Likewise.
* guix/pki.scm (ensure-acl, current-acl): Likewise.
* guix/scripts/archive.scm (authorize-key)[read-key]: Likewise.
* guix/scripts/authenticate.scm (read-canonical-sexp)
(read-hash-data): Likewise.
* guix/scripts/download.scm: Likewise.
* guix/scripts/offload.scm (register-gc-root, remove-gc-roots)
(send-files): Likewise.
* guix/scripts/publish.scm (lazy-read-file-sexp): Likewise.
* guix/scripts/refresh.scm: Likewise.
* guix/scripts/substitute.scm (check-acl-initialized): Likewise.
* guix/serialization.scm (read-maybe-utf8-string): Likewise.
* guix/scripts/hash.scm (guix-hash): Use 'force-output' instead of
'flush-output-port'.
* guix/store.scm (process-stderr): Likewise.
* guix/tests.scm: Likewise.
* guix/utils.scm: Use (ice-9 binary-ports) and autoload (rnrs io ports)
for 'make-custom-binary-input-port'.

lint: Suggest @code instead of quotes.

* guix/scripts/lint.scm (%quoted-identifier-rx): New variable.
(check-description-style)[check-quotes]: New procedure.
Use it.
* tests/lint.scm ("description: suggest ornament instead of quotes"):
New test.

gnu: Add Ao.

* gnu/packages/engineering.scm (ao): New variable.

gnu: glfw: Propagate the relevant inputs.

* gnu/packages/gl.scm (glfw)[inputs]: Rename to...
[propagated-inputs]: ... this.  Add LIBXXF86VM.

container: Allow 'container-excursion' to the same namespaces.

Before that, 'container-excursion' would call 'setns' even when the
target namespace is the one the caller is already in, which would fail.

* gnu/build/linux-container.scm (container-excursion): Introduce
'source' and 'target'.  Compare the result of 'readlink' on these
instead of comparing file descriptors to decide whether to call
'setns'.
* tests/containers.scm ("container-excursion, same namespace"): New test.

gnu: Add r-biocstyle.

* gnu/packages/bioinformatics.scm (r-biocstyle): New variable.

gnu: Add r-biocviews.

* gnu/packages/bioinformatics.scm (r-biocviews): New variable.

gnu: Add iperf.

* gnu/packages/networking.scm (iperf): New variable.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu: python-dateutil, python-dateutil-2: Update to new home-page.

* gnu/packages/python.scm (python-dateutil, python2-dateutil,
  python-dateutil-2, python2-dateutil-2)[home-page]: Update URL.

gnu: Add r-optparse.

* gnu/packages/bioinformatics.scm (r-optparse): New variable.

gnu: Add r-getopt.

* gnu/packages/bioinformatics.scm (r-getopt): New variable.

gnu: Add GHC 8.0.1.

* gnu/packages/haskell.scm (ghc-8): New variable.

gnu: Add ghc-hashtables.

* gnu/packages/haskell.scm (ghc-hashtables): New variable.

gnu: Add ghc-easyplot.

* gnu/packages/haskell.scm (ghc-easyplot): New variable.

gnu: Add ghc-hmatrix-gsl-stats.

* gnu/packages/haskell.scm (ghc-hmatrix-gsl-stats): New variable.

gnu: Add ghc-hmatrix-special.

* gnu/packages/haskell.scm (ghc-hmatrix-special): New variable.

gnu: Add ghc-hmatrix-gsl.

* gnu/packages/haskell.scm (ghc-hmatrix-gsl): New variable.

gnu: Add ghc-hmatrix.

* gnu/packages/haskell.scm (ghc-hmatrix): New variable.