services: Export *-service-type and *-configuration.

This allows users to use 'modify-services' and similar constructs for
all these service types.

* gnu/services/avahi.scm: export avahi-configuration.
* gnu/services/base.scm: export gpm-configuration and
rngd-configuration.
* gnu/services/databases.scm: export *-service-type and *-configuration.
* gnu/services/dbus.scm: export dbus-configuration.
* gnu/services/dict.scm: export dicod-service-type.
* gnu/services/lirc.scm: export lirc-configuration and
lirc-service-type.
* gnu/services/mail.scm: export dovecot-service-type.
* gnu/services/web.scm: export nginx-configuration and
nginx-service-type.
* gnu/services/xorg.scm: export screen-locker and screen-locker?.
* gnu/services/ssh.scm: export lsh-configuration and lsh-service-type.
* gnu/services/desktop.scm: export *-service, *-service-type
and *-configuration.
* gnu/services/networking.scm: export *-configuration
and *-service-type.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

gnu: tesseract-ocr: Update to 3.04.01.

* gnu/packages/ocr.scm (tesseract-ocr): Update to 3.04.01.
[source]: Download from Github, add 'file-name' field, remove snippet.
[native-inputs]: Remove autoconf, automake, libtool.
[propagated-inputs]: Move leptonica ...
[inputs]: ... to here.
[arguments]: Remove 'autogen phase.
[home-page]: Move program's home-page to Github.

gnu: gnuplot: Update to 5.0.4.

* gnu/packages/maths.scm (gnuplot): Update to 5.0.4.

gnu: dovecot: Update to 2.2.25.

* gnu/packages/mail.scm (dovecot): Update to 2.2.25.

gnu: texlive: Use https.

* gnu/packages/tex.scm (texlive-bin, texlive-texmf, texlive)[license]:
Use 'https' in the url.
[home-page]: Use 'https' in the url.

gnu: texlive: Update in-place source updates.

* gnu/packages/tex.scm (texlive-texmf-source, texlive-bin)[source]:
Update to 20160523b.

gnu: msmtp: Update to 1.6.5.

* gnu/packages/mail.scm (msmtp): Update to 1.6.5.
[source]: Update source URL.

gnu: superlu-dist: Remove non-free source.

* gnu/packages/maths.scm (superlu-dist)[source]: Replace non-free
mc64ad.c source with stub.

gnu: slepc: Update to 3.7.1.

* gnu/packages/maths.scm (slepc): Update to 3.7.1.

gnu: petsc: Update to 3.7.2.

* gnu/packages/maths.scm (petsc): Update to 3.7.2.
[arguments]: Adjust scrubbed files.

gnu: petsc: Make header generation reproducible.

* gnu/packages/maths.scm (petsc)[arguments]: Scrub timestamp from
  petscmachineinfo.h header.

gnu: petsc: Use modify-phases.

* gnu/packages/maths.scm (petsc)[arguments]: Use modify-phases.

gnu: openmpi: Make binaries reproducible.

* gnu/packages/mpi.scm (openmpi)[arguments]: Remove timestamps from
source files.  Delete installed configure logs.

gnu: openmpi: Update to 1.10.3.

* gnu/packages/mpi.scm (openmpi): Update to 1.10.3.
[source]: Use https.

gnu: superlu: Update to 5.2.1.

* gnu/packages/maths.scm (superlu): Update to 5.2.1.
[source]: Remove non-free MC64 code.
[inputs]: Use openblas instead of lapack's BLAS.
[build-system]: Use cmake-build-system.
[arguments]: Remove custom phases and replace with CMake flags.
[license]: List additional licenses for some source and example files.

gnu: Add libhilbert.

* gnu/packages/maths.scm (libhilbert): New variable.

pull: Update the version string.

Fixes <http://bugs.gnu.org/19278>.
Reported by Tomáš Čech <tcech@suse.cz>.

This allows 'guix --version' to return something that better represents
what version is being used.

* build-aux/build-self.scm (date-version-string): New procedure.
(build): Add #:version.
[builder]: Pass it to 'build-guix' as #:package-version.

pull: Install (guix config) module to override the user's one.

* build-aux/build-self.scm (zlib, gzip, bzip2, xz): New variables.
(build)[storedir, localstatedir, sysconfdir, sbindir]: New variables.
[builder]: Pass them to 'build-guix'.
* guix/build/pull.scm (build-guix): Add #:system, #:storedir,
  #:localstatedir, #:sysconfdir, #:sbindir, #:package-name,
  #:package-version, #:bug-report-address, #:home-page-url, #:libgcrypt,
  #:zlib, #:gzip, #:bzip2, and #:xz.  Remove #:gcrypt.
  Instantiate all the substitution variables in (guix config).  Remove
  code to delete OUT/guix/config.{scm,go}.
* guix/config.scm.in: Add note about (guix script pull).

config: Export the raw installation directories.

* guix/config.scm.in (%storedir, %localstatedir)
(%sysconfdir, %sbindir): New variables.
(%store-directory): Use %STOREDIR.
(%state-directory): Use %LOCALSTATEDIR.
(%config-directory): Use %SYSCONFDIR.
(%guix-register-program): Use %SBINDIR.

gnu: Add allegro-5.0.

* gnu/packages/game-development.scm (allegro-5.0): New variable.