gnu: screen: Remove unneeded configure flags.

* gnu/packages/screen.scm (screen)[arguments]: Remove --infodir and
--mandir, which are no longer needed.

gnu: screen: Support 256 colors.

* gnu/packages/screen.scm (screen)[arguments]: Pass --enable-colors256.

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

gnu: linux-libre: Update to 4.6.4.

* gnu/packages/linux.scm (linux-libre): Update to 4.6.4.

gnu: linux-libre-4.4: Update to 4.4.15.

* gnu/packages/linux.scm (linux-libre-4.4): Update to 4.4.15.

lint: 'validate-uri' reports suspiciously small 200 responses.

* guix/scripts/lint.scm (validate-uri): Upon 200 http-response, check
the 'response-content-length' and emit a warning when it is <= 1000.
* tests/lint.scm (call-with-http-server): Add 'data' parameter.
(with-http-server): Likewise.
(%long-string): New variable.
("home-page: 200"): Pass %LONG-STRING to 'with-http-server'.
("home-page: 404", "source: 200", "source: 404"): Likewise.
("home-page: 200 but short length"): New test.
("source: 200 but short length"): New test.

download: Attempt to update SourceForge mirror URLs.

* guix/download.scm (%mirrors)[sourceforge]: End in "/project" instead
of "/sourceforge".  Remove a couple of dangling URLs.

gnu: Add gptfdisk.

* gnu/packages/disk.scm (gptfdisk): New variable.

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

gnu: emacs-flycheck: Add missing dependency on emacs-seq.

Fixes a regression introduced in
afb6fdaa5de2607261015372f31b1c19fd503a61.

* gnu/packages/emacs.scm (flycheck)[propagated-inputs]: Add EMACS-SEQ.

packages: <origin> no longer has an 'imported-modules' field.

* guix/packages.scm (<origin>)[imported-modules]: Remove.
(patch-and-repack): Remove #:imported-modules.  Use
'with-imported-modules'.  Remove #:modules argument to
'gexp->derivation'.
(origin->derivation): Adjust accordingly.
* doc/guix.texi (origin Reference): Adjust accordingly.

gnu: Remove unneeded 'imported-modules' fields for 'origin'.

* gnu/packages/engineering.scm (fastcap)[source](modules,
imported-modules): Remove.
* gnu/packages/wm.scm (awesome)[source](imported-modules): Remove.
* tests/packages.scm ("package-source-derivation, snippet"): Remove
'imported-modules' field.

gexp: Remove more uses of #:modules.

* guix/scripts/system.scm (switch-to-system): Adjust comment.
* tests/gexp.scm ("gexp->derivation #:references-graphs"): Use
'with-imported-modules' instead of #:modules.
* tests/grafts.scm ("graft-derivation, preserve empty directories"):
Likewise.

gexp: 'program-file' and 'gexp->script' no longer have #:modules.

* guix/gexp.scm (<program-file>)[modules]: Remove.
(program-file): Remove #:modules and adjust accordingly.
(program-file-compiler): Likewise.
(gexp->script): Likewise.

gexp: 'computed-file' no longer has a #:modules parameter.

* guix/gexp.scm (<computed-file>)[modules]: Remove.
(computed-file): Remove #:modules.
(computed-file-compiler): Likewise.
* doc/guix.texi (G-Expressions): Adjust accordingly.

download: Use 'with-imported-modules'.

* guix/cvs-download.scm (cvs-fetch): Use 'with-imported-modules' instead
of the #:modules argument of 'gexp->derivation'.
* guix/download.scm (url-fetch): Likewise.
* guix/git-download.scm (git-fetch): Likewise.
* guix/hg-download.scm (hg-fetch): Likewise.
* guix/svn-download.scm (svn-fetch): Likewise.

profiles: Use 'with-imported-modules'.

* guix/profiles.scm (info-dir-file): Use 'with-imported-modules' instead
of the #:module argument to 'gexp->derivation'.
(ghc-package-cache-file): Likewise.
(ca-certificate-bundle): Likewise.
(gtk-icon-themes): Likewise.
(xdg-desktop-database): Likewise.
(xdg-mime-database): Likewise.
(profile-derivation): Likewise.

services: <shepherd-service> no longer has an 'imported-modules' field.

* gnu/services/shepherd.scm (<shepherd-service>)[imported-modules]:
Remove.
(%default-imported-modules): Make private.
(shepherd-service-file): Use 'with-imported-modules'.
(shepherd-configuration-file): Remove 'modules' and the calls to
'imported-modules' and 'compiled-modules'.  Use
'with-imported-modules' instead.
* doc/guix.texi (Shepherd Services): Adjust accordingly.
* gnu/services/base.scm (file-system-shepherd-service): Use
'with-imported-modules'.  Remove 'imported-modules' field.
* gnu/system/mapped-devices.scm (device-mapping-service-type): Remove
'imported-modules'.
(open-luks-device): Use 'with-imported-modules'.
* gnu/tests.scm (marionette-shepherd-service): Remove 'imported-modules'
field and use 'with-imported-modules'.

gnu: Use 'gexp->file' in conjunction with 'with-imported-modules'.

* gnu/services.scm (activation-script): Remove code to set '%load-path'
and use 'with-imported-modules' instead.
(cleanup-gexp): Likewise.
* gnu/system/vm.scm (%vm-module-closure): New variable.
(expression->derivation-in-linux-vm): Remove #:modules.
[loader]: Remove code to set '%load-path'.
[builder]: Use %VM-MODULE-CLOSURE.
(qemu-image): Use 'with-imported-modules'.

gexp: 'gexp->file' emits code to set '%load-path'.

* guix/gexp.scm (gexp->file): Add #:set-load-path? parameter and honor it.
* gnu/system.scm (operating-system-parameters-file): Pass
  #:set-load-path? #f.
* doc/guix.texi (G-Expressions): Adjust accordingly.

gexp: Factorize load-path-setting expression.

* guix/gexp.scm (load-path-expression): New procedure.
(gexp->script): Use it.

linux-container: Fix list of imported modules.

This fixes a regression introduced in
958dd3ce68733bcd5c1231424c7e4ad39e67594a.

* gnu/system/linux-container.scm (container-script)[script]: Add (guix
combinators) to the list of imported modules.