distro: bigloo: Update to 4.0a.

* gnu/packages/scheme.scm (bigloo): Update to 4.0a.

distro: gnutls: Adjust to the latest version.

* gnu/packages/gnutls.scm (gnutls): Remove the #:parallel-build?
  argument, which is no longer needed.  Remove the commented-out LZO
  input, since GnuTLS no longer supports it since 3.0.0.

distro: gnutls: Use the GnuPG mirrors.

* gnu/packages/gnutls.scm (gnutls): Use the gnutls.org/GnuPG URL.

doc: Add a "GNU Distribution" node.

* doc/guix.texi (Introduction): Add cross-reference to "GNU
  Distribution".
  (Features): Mention reproducibility.
  (Invoking guix-package): Add cross-reference to "GNU Distribution".
  (GNU Distribution): New node.

distro: Rename (distro) to (gnu packages).

* distro.scm: Rename to...
* gnu/packages.scm: ... this.  Update all users accordingly.
* Makefile.am (MODULES): Adjust accordingly.
* po/POTFILES.in: Likewise.

distro: Change the module name space to (gnu ...).

* distro: Rename to...
* gnu: ... this.  Update module names accordingly.
* Makefile.am: Adjust accordingly.
* po/POTFILES.in: Likewise.
* distro.scm: Search for files under /gnu/packages instead of
  /distro/packages.
* gnu/packages/base.scm (ld-wrapper-boot3): Likewise.

Update `HACKING'.

* HACKING: Capitalize the title.
  (Running Guix before it is installed): New section.
  (Adding new packages): Update example.

Move Andreas to `AUTHORS'.

doc: Mark binary deployment as not implemented yet.

* doc/guix.texi (Features): Add a footnote saying that binary deployment
  is missing.

distro: Add libtiff.

* distro/packages/libtiff.scm: New file.
* Makefile.am (MODULES): Add it.

distro: Add Libjpeg 8.

* distro/packages/libjpeg.scm (libjpeg-8): New variable.

distro: Add file.

* distro/packages/file.scm: New file.
* Makefile.am (MODULES): Add it.

distro: Add Libjpeg.

* distro/packages/libjpeg.scm: New file.
* Makefile.am (MODULES): Add it.

distro: flex: Add dependency on Indent.

* distro/packages/flex.scm (flex): Add Indent as input.

distro: Add Indent.

* distro/packages/indent.scm: New file.
* Makefile.am (MODULES): Add it.

guix-package: Allow `--roll-back' to skip missing generations.

* guix-package.in (profile-numbers): New procedure.
  (latest-profile-number): Use it.
  (previous-profile-number): New procedure.
  (roll-back): Use it lieu of `1-'.  Check whether PREVIOUS-NUMBER is
  zero, and raise an error when it is.
* tests/guix-package.sh: Test whether we can roll back over a "hole".

guix-package: Add `--roll-back'.

Based on a patch by Nikita Karetnikov <nikita@karetnikov.org>.

* guix-package.in (profile-regexp): New procedure.
  (latest-profile-number): Remove `%profile-rx', and use
  `profile-regexp' instead.
  (profile-number, roll-back): New procedure.
  (show-help): Add `--roll-back'.
  (%options): Likewise.
  (guix-package)[process-actions]: First check whether `roll-back?' is
  among OPTS, and call `roll-back' if it is, followed by a recursive
  call to `process-actions'.  Emit the "nothing to be done" message only
  when INSTALL or REMOVE is non-empty.
* tests/guix-package.sh (readlink_base): New function.
  Add tests for `--roll-back'.
* doc/guix.texi (Invoking guix-package): Document `--roll-back'.

distro: gnutls: Update to 3.1.6.

* distro/packages/gnutls.scm (gnutls): Update to 3.1.6.

packages: Change `base32' to allow non-literal strings.

* guix/packages.scm (base32): Allow arguments that are not literal strings.

distro: nettle: Update to 2.6.

* distro/packages/nettle.scm (nettle): Update to 2.6.