gnu: Add emacs-pretty-mode.

* gnu/packages/emacs.scm (emacs-pretty-mode): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

gnu: magit: Update to 2.10.2.

* gnu/packages/emacs.scm (magit, emacs-magit-popup): Update to 2.10.2.

gnu: pugixml: Update to 1.8.1.

* gnu/packages/xml.scm (pugixml): Update to 1.8.1.
[arguments]: Remove ‘chdir’ phase and allow #:out-of-source building.
Add comment about the lack of tests.

gnu: perl-xml-compile-wsdl11: Update to 3.06.

* gnu/packages/xml.scm (perl-xml-compile-wsdl11): Update to 3.06.

gnu: perl-xml-compile-soap: Update to 3.21.

* gnu/packages/xml.scm (perl-xml-compile-soap): Update to 3.21.

gnu: youtube-dl: Update to 2017.02.16.

* gnu/packages/video.scm (youtube-dl): Update to 2017.02.16.

gnu: Add ocaml-ppx-compare.

* gnu/packages/ocaml.scm (ocaml-ppx-compare): New variable.

gnu: Add ocaml-ppx-bench.

* gnu/packages/ocaml.scm (ocaml-ppx-bench): New variable.

gnu: Add ocaml-ppx-inline-test.

* gnu/packages/ocaml.scm (ocaml-ppx-inline-test): New variable.

gnu: Add ocaml-ppx-type-conv.

* gnu/packages/ocaml.scm (ocaml-ppx-type-conv): New variable.

gnu: Add ocaml-ppx-deriving.

* gnu/packages/ocaml.scm (ocaml-ppx-deriving): New variable.

gnu: Add ocaml-cppo.

* gnu/packages/ocaml.scm (ocaml-cppo): New variable.

gnu: Add ocaml-ppx-driver.

* gnu/packages/ocaml.scm (ocaml-ppx-driver): New variable.

gnu: Add ocaml-ppx-optcomp.

* gnu/packages/ocaml.scm (ocaml-ppx-optcomp): New variable.

gnu: Add ocaml-ppx-core.

* gnu/packages/ocaml.scm (ocaml-ppx-core): New variable.

gnu: Add ocaml-fieldslib.

* gnu/packages/ocaml.scm (ocaml-fieldslib): New variable.

gnu: gptfdisk: Install the documentation.

* gnu/packages/disk.scm (gptfdisk)[arguments]: Install the manpages.

gnu: python-icalendar: Update to 3.11.3.

* gnu/packages/python.scm (python-icalendar): Update to 3.11.3.

gnu: Add qutebrowser.

* gnu/packages/web.scm (qutebrowser): New variable.

gnu: python-pyqt: Propagate python-sip.

* gnu/packages/qt.scm (python-pyqt)[propagated-inputs]: New field.