build-system/glib-or-gtk: Fix default value of #:glib-or-gtk-wrap-excluded-outputs.

Fixes <http://bugs.gnu.org/19321>.
Reported by Mark H Weaver <mhw@netris.org>.

* guix/build-system/glib-or-gtk.scm (glib-or-gtk-build): Change default
  value of #:glib-or-gtk-wrap-excluded-outputs to ''().

gnu: licenses: Add NCSA license.

* guix/licenses.scm (ncsa): New variable.

substitute-binary: Add missing newline in download progress report.

Fixes <http://bugs.gnu.org/19313>.
Reported by rekado <rekado@elephly.net>.

* guix/scripts/substitute-binary.scm (guix-substitute-binary)
  <--substitute>: Add 'newline' call.

system: Don't make /boot/grub/grub.cfg a symlink to the store.

This would not work when /boot is a separate partition, as reported by
Nikita Karetnikov <nikita@karetnikov.org> in <http://bugs.gnu.org/19220>.
This fixes a regression introduced in 39d1f82.

* gnu/build/install.scm (install-grub): Copy GRUB.CFG instead of
  symlinking it, as was the case before 39d1f82.
* gnu/build/vm.scm (register-grub.cfg-root): Add 'grub.cfg' parameter.
  Make it a permanent GC root instead of an indirect GC root.
  (initialize-hard-disk): Adjust accordingly.
* guix/scripts/system.scm (install-grub*): Replace use of
  'add-indirect-root' by the addition of a permanent GC root in
  %GC-ROOTS-DIRECTORY.

build-system/python: Add handling of 'propagated-inputs' in
'package-with-explicit-python'.

* guix/build-system/python.scm (package-with-explicit-python): Add mapping for
  'propagated-inputs'.

guix system: Fix typo affecting 'guix system init'.

Fixes <http://bugs.gnu.org/19279>.
Fixes a regression introduced in cc7fa59.
Reported by Tomas Cech <tcech@suse.cz>.

* guix/scripts/system.scm (install): Fix order of arguments to 'lift'
  and 'lift2'.

guix: scripts: Parse $GUIX_BUILD_OPTIONS separately.

Appending to "raw" args broke optional parameters in 'guix package -I'
and 'guix package -A', and possibly other places.  Therefore, switch to
parsing each set of options on its own and append resulting alists
together afterwards.

* guix/scripts/archive.scm (parse-options-from): Rename from
  (parse-options) and add explicit argument.  New form of (parse-options)
  using its old algorithm via -from function.
* guix/scripts/build.scm: Ditto.
* guix/scripts/environment.scm: Ditto.
* guix/scripts/package.scm: Ditto.
* guix/scripts/system.scm: Ditto.
* tests/guix-package.sh: Add test.
* doc/guix.texi (Invoking guix build): Make it clear that the options
  are parsed independently.

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

system: Make /boot/grub/grub.cfg an indirect GC root.

Fixes <http://bugs.gnu.org/19160>.

* guix/scripts/system.scm (install-grub*): Make /boot/grub/grub.cfg an
  indirect GC root.
* gnu/build/install.scm (install-grub): Make TARGET a symlink.
* gnu/build/vm.scm (register-grub.cfg-root): New procedure.
  (initialize-hard-disk): Use it.

guix system: Factorize 'grub-install' error handling, and use more 'mbegin'.

* guix/scripts/system.scm (install-grub*): New procedure.
  (install): Use it, and use 'mwhen?'.
  (perform-action) <reconfigure>: Likewise.

build: emacs-utils: Add 'emacs-generate-autoloads'.

* guix/build/emacs-utils.scm (emacs-generate-autoloads): New procedure.

packages: Use the target's system Guile when downloading patches.

* guix/packages.scm (patch-and-repack)[patch-inputs]: Pass SYSTEM in
  'package-source-derivation' call.

derivations: Export 'derivation-builder'.

* guix/derivations.scm: Export 'derivation-builder'.

monads: Add 'lift0'.

* guix/monads.scm (lift0): New variable.

monads: Add 'mwhen' and 'munless'.

* guix/monads.scm (mbegin): Add special '%current-monad' syntactic
  keyword.
  (mwhen, munless): New macros.

guix system: Use 'mbegin' for 'install'.

* guix/scripts/system.scm (install): Use 'mbegin'.  Lift FORMAT and
  POPULATE-ROOT-FILE-SYSTEM, and use the result.

build-system/glib-or-gtk: Allow specific outputs to be excluded from wrapping.

* guix/build/glib-or-gtk-build-system.scm (wrap-all-programs): Add
  #:glib-or-gtk-wrap-excluded-outputs parameter and honor it.
* guix/build-system/glib-or-gtk.scm (glib-or-gtk-build): Add
  #:glib-or-gtk-wrap-excluded-outputs parameter and pass it in BUILDER.
* doc/guix.texi (Build Systems): Mention it.

build-system/glib-or-gtk: Correctly handle multiple-output packages.

* guix/build/glib-or-gtk-build-system.scm (wrap-all-programs): Move body
  to 'handle-output' inner procedure, and parametrize it by output name
  and directory.  Call it for each element of OUTPUTS.
  (compile-glib-schemas): Likewise.

build-system/glib-or-gtk: Use 'for-each' and 'cut' as appropriate.

* guix/build/glib-or-gtk-build-system.scm (wrap-all-programs): Use
  'for-each' instead of 'map' in for-effect contexts.  Use 'cut' instead
  of 'lambda' when appropriate.

build-system/glib-or-gtk: Clean up whitespace.

* guix/build/glib-or-gtk-build-system.scm: M-x whitespace-cleanup.

guix: scripts: Add GUIX_BUILD_OPTIONS environment handling.

* doc/guix.texi (Invoking guix build): Mention 'GUIX_BUILD_OPTIONS'.
* guix/scripts/archive.scm: (append args (environment-build-options)).
* guix/scripts/build.scm: Ditto.
* guix/scripts/environment.scm: Ditto.
* guix/scripts/package.scm: Ditto.
* guix/scripts/system.scm: Ditto.
* guix/ui.scm (environment-build-options): New function.
* guix/utils.scm (arguments-from-environment-variable): New function.
* tests/guix-build.sh: Add tests.
* test-env.in: Unset GUIX_BUILD_OPTIONS.

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