gnu: Add perl-uri.

* gnu/packages/web.scm (perl-uri): New variable.

gnu: Add perl-http-date.

* gnu/packages/web.scm (perl-http-date): New variable.

gnu: Add perl-html-parser.

* gnu/packages/web.scm (perl-html-parser): New variable.

gnu: Add perl-html-tagset.

* gnu/packages/web.scm (perl-html-tagset): New variable.

gnu: Rename perl-xml-parser-perlsax to perl-libxml.

* gnu/packages/xml.scm (perl-libxml): Rename from perl-xml-parser-perlsax.

gnu: dmd: Add 'pam-services' field to <service>.

* gnu/system/dmd.scm (<service>)[pam-services]: New field.
  (mingetty-service): Add #:motd and #:allow-empty-passwords?
  parameters.  Add MOTD to 'inputs' field; add 'pam-services' field.
* gnu/system/vm.scm (system-qemu-image): Aggregate PAM entries from
  SERVICES.

gnu: vm: Fix inputs in 'file-union'.

* gnu/system/vm.scm (file-union): Filter out members of FILES that are
  outputs of INPUTS.

gnu: dmd: Add 'user-accounts' and 'user-groups' fields to <service>.

* gnu/system/shadow.scm (guix-build-accounts): Move to...
* gnu/system/dmd.scm (guix-build-accounts): ... here.
  (<service>)[user-accounts, user-groups]: New fields.
  (guix-service): New #:build-user-id and #:build-accounts parameters.
  Use 'guix-build-accounts' and set the 'user-accounts' and
  'user-groups' fields accordingly.
* gnu/system/vm.scm (system-qemu-image): Remove use of
  'guix-build-accounts'.  Augment ACCOUNTS and GROUPS from what SERVICES
  demand.

doc: Adjust "Building from Git" instructions.

* HACKING (Building from Git): As a follow-up to ff1cbb9, update the
  error reported when pkg.m4 is missing.  Suggested by
  John Darrington <john@darrington.wattle.id.au>.

gnu: Move /etc/resolv.conf handling to the networking service.

* gnu/system/vm.scm (etc-directory): Remove 'resolv.conf'.
  (system-qemu-image): Use 'static-networking-service' with
  #:name-servers.  Don't populate the image with /etc/resolv.conf.
* gnu/system/dmd.scm (static-networking-service): Add #:name-servers
  parameter.  Use it to populate /etc/resolv.conf.

gnu: vm: Factorize /etc creation.

* gnu/system/vm.scm (expression->derivation-in-linux-vm)[lower-inputs]:
  Move to top-level...
  (lower-inputs): ... here.  New variable.
  (file-union, etc-directory): New procedures.
  (system-qemu-image): Use 'etc-directory'; remove redundant code, and
  register the result of 'etc-directory' as a GC root.

gnu: pulseaudio: Disable tests on mips64el.

* gnu/packages/pulseaudio.scm (pulseaudio): Drop tests also on mips64el.

gnu: Add perl-xml-regexp.

* gnu/packages/xml.scm (perl-xml-regexp): New variable.

gnu: Add perl-xml-parser-perlsax.

* gnu/packages/xml.scm (perl-xml-parser-perlsax): New variable.

gnu: libmicrohttpd: Upgrade to 0.9.32.

* gnu/packages/gnunet.scm (libmicrohttpd): Upgrade to 0.9.32.

gnu: soprano: Add input raptor2.

* gnu/packages/rdf.scm (soprano): Add input raptor2.

gnu: Add raptor2.

* gnu/packages/rdf.scm (raptor2): New variable.

gnu: pulseaudio: Fix typo introduced in 76dcc99.

* gnu/packages/pulseaudio.scm (pulseaudio): Disable tests on i686.
  (pavucontrol): Remove 'arguments'.

monads: Remove erroneous comment.

* guix/monads.scm (sequence): Remove erroneous comment.

gnu: pulseaudio: Disable tests on i686.

* gnu/packages/pulseaudio.scm (pavucontrol): New 'arguments' field.