doc: Add a note about optional GnuTLS dependency.

* README (Requirements): add a note about 'guix download''s GnuTLS dependency.
* doc/guix.texi (Requirements): Likewise.

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

doc: Add cross-reference to the gnutls-guile manual.

* doc/guix.texi (Invoking guix download): Add cross-reference to the
  gnutls-guile manual.

gnu: Add miscfiles

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

gnu: Add prefix to license imports in (gnu packages feh).

* gnu/packages/feh.scm: Import (guix licenses) with #:prefix license: to avoid
  importing 'imlib2' from both (gnu packages image) and (guix licenses).

gnu: ruby: Miscellaneous improvements to package definition.

* gnu/packages/ruby.scm (ruby): Compute major+minor version string for the
  source URI.  Switch to the .bz2 tarball and update the hash accordingly.
  Remove 'autoconf' from the inputs.  Change 'native-search-paths' to the
  directory that is actually created by the build.  Remove the package name
  from the synopsis.
  (ruby-1.8): Compute major+minor version string for the source URI, and avoid
  the use of 'name' in the URI computation.  Remove 'name' field, since it is
  inherited and no longer needed.

gnu: Add ruby 1.8.7.

* gnu/packages/ruby.scm (ruby-1.8): New variable.

gnu: gnutls: Fix path to a guile site directory.

Suggested by Ludovic Courtès.

* gnu/packages/gnutls.scm (gnutls): Add '--with-guile-site-dir' configure
  flag.

gnu: parallel: Update to 20141022.

* gnu/packages/parallel.scm (parallel): Update to 20141022.

gnu: tor: Update to 0.2.5.10.

* gnu/packages/tor.scm (tor): Update to 0.2.5.10.

licenses: Add 'imlib2'.

* guix/licenses.scm (imlib2): New variable.
* gnu/packages/image.scm (imlib2): Use it.

gnu: Some cleanup based on lint checkers.

* gnu/packages/admin.scm, gnu/packages/aidc.scm, gnu/packages/algebra.scm,
  gnu/packages/apr.scm, gnu/packages/avahi.scm, gnu/packages/backup.scm,
  gnu/packages/base.scm, gnu/packages/calcurse.scm, gnu/packages/cdrom.scm,
  gnu/packages/check.scm, gnu/packages/compression.scm, gnu/packages/cook.scm,
  gnu/packages/crypto.scm, gnu/packages/cryptsetup.scm, gnu/packages/curl.scm,
  gnu/packages/cyrus-sasl.scm, gnu/packages/databases.scm,
  gnu/packages/doxygen.scm, gnu/packages/dwm.scm, gnu/packages/elf.scm,
  gnu/packages/emacs.scm, gnu/packages/feh.scm, gnu/packages/file.scm,
  gnu/packages/fish.scm, gnu/packages/flex.scm, gnu/packages/fltk.scm,
  gnu/packages/fontutils.scm, gnu/packages/games.scm, gnu/packages/gcal.scm,
  gnu/packages/gcc.scm, gnu/packages/geeqie.scm, gnu/packages/ghostscript.scm,
  gnu/packages/gimp.scm, gnu/packages/gl.scm, gnu/packages/glib.scm,
  gnu/packages/gnome.scm, gnu/packages/gnunet.scm, gnu/packages/gnupg.scm,
  gnu/packages/gperf.scm, gnu/packages/grub.scm, gnu/packages/gsasl.scm,
  gnu/packages/gtk.scm, gnu/packages/guile-wm.scm, gnu/packages/guile.scm,
  gnu/packages/hurd.scm, gnu/packages/icu4c.scm, gnu/packages/image.scm,
  gnu/packages/imagemagick.scm, gnu/packages/irssi.scm, gnu/packages/kde.scm,
  gnu/packages/libdaemon.scm, gnu/packages/libevent.scm,
  gnu/packages/libidn.scm, gnu/packages/libusb.scm, gnu/packages/linux.scm,
  gnu/packages/lout.scm, gnu/packages/lsh.scm, gnu/packages/lsof.scm,
  gnu/packages/lua.scm, gnu/packages/maths.scm, gnu/packages/mcrypt.scm,
  gnu/packages/mp3.scm, gnu/packages/netpbm.scm, gnu/packages/noweb.scm,
  gnu/packages/ocaml.scm, gnu/packages/openssl.scm, gnu/packages/pcre.scm,
  gnu/packages/pdf.scm, gnu/packages/pkg-config.scm,
  gnu/packages/pretty-print.scm, gnu/packages/python.scm, gnu/packages/qt.scm,
  gnu/packages/rsync.scm, gnu/packages/scheme.scm, gnu/packages/scrot.scm,
  gnu/packages/sdl.scm, gnu/packages/skribilo.scm, gnu/packages/ssh.scm,
  gnu/packages/stalonetray.scm, gnu/packages/tcl.scm, gnu/packages/tcsh.scm,
  gnu/packages/telephony.scm, gnu/packages/texlive.scm, gnu/packages/tor.scm,
  gnu/packages/valgrind.scm, gnu/packages/version-control.scm,
  gnu/packages/vim.scm, gnu/packages/vpn.scm, gnu/packages/w3m.scm,
  gnu/packages/web.scm, gnu/packages/wordnet.scm, gnu/packages/xiph.scm,
  gnu/packages/xml.scm, gnu/packages/xorg.scm, gnu/packages/zile.scm,
  gnu/packages/zip.scm, gnu/packages/zsh.scm [synopsis, description]: Adjust
  according to lint checkers.
* gnu/packages/fltk.scm (fltk)[source]: Wrap long line in uri.
* /gnu/packages/xiph.scm (libogg, libtheora, vorbis-tools)[source]: Same.

guix: lint: Make exception for package name starting description.

* guix/scripts/lint.scm (check-description-style): Exception for
  upper-case rule if the description starts with the package name.
* tests/lint.scm: Test it.

guix: lint: Allow digits at start of synopsis or description.

* guix/scripts/lint.scm (start-with-capital-letter?): Rename too...
  (properly-starts-sentence?): Rewrite with regex and add digits.
  (check-description-style, check-synopsis-style): Use it.
* tests/lint.scm: Add tests.

guix: lint: Check for empty synopses and descriptions.

* guix/scripts/lint.scm (check-description-style,
  check-synopsis-style): New emptiness checks.
* tests/lint.scm: Test them.

guix: lint: Check for proper end-of-sentence space.

* guix/scripts/lint.scm (start-with-capital-letter?): Handle empty
  strings.
  (check-description-style): New check for end-of-sentence space.
* tests/lint.scm: Test it.

guix: lint: Use if/when consistently.

* guix/scripts/lint.scm (check-synopsis-style): Replace single-branch
  uses of if with when.
  (check-patches): Same

guix: lint: Use string-suffix? and string-prefix? where appropriate.

* guix/scripts/lint.scm (check-synopsis): Use string-suffix? and
  string-prefix? in place of string-take and string=?.

gnu: Add ATLAS.

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

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

Update name and email address for Joshua Grant.

gnu: Add cppunit

* gnu/packages/check.scm (cppunit): New variable.