Video multiboot support.
* include/grub/multiboot.h (grub_multiboot_set_accepts_video):
New prototype.
* include/multiboot.h: Resynced with multiboot specification.
* include/multiboot2.h: Likewise.
* loader/i386/multiboot.c (UNSUPPORTED_FLAGS): Support video flags.
(grub_multiboot): Parse MULTIBOOT_VIDEO_MODE fields.
* loader/i386/multiboot_mbi.c (DEFAULT_VIDEO_MODE): New constant.
(HAS_VGA_TEXT): Likewise.
(accepts_video): New variable.
(grub_multiboot_set_accepts_video): New function.
(grub_multiboot_get_mbi_size): Account for video structures.
(set_video_mode): New function.
(retrieve_video_parameters): Likewise.
(grub_multiboot_make_mbi): Fill video fields.
Video driver ids.
* include/grub/video.h (grub_video_driver_id): New type.
(grub_video_adapter): New member 'id'. All users updated.
(grub_video_get_driver_id): New proto.
* video/video.c (grub_video_get_driver_id): New function.
* include/grub/i386/loader.h (grub_linux16_boot): Renamed to ...
(grub_linux16_real_boot): ... this.
* kern/i386/loader.S: Likewise.
* loader/i386/pc/linux.c: Include `<grub/video.h>' and `<grub/mm.h>'.
(grub_linux16_boot): New function. Switches to text mode and calls
grub_linux16_real_boot().
* loader/i386/bsd.c: Include `<grub/video.h>'.
(grub_freebsd_boot, grub_openbsd_boot, grub_netbsd_boot): Switch to
text mode before calling grub_unix_real_boot().
* loader/i386/multiboot.c: Include `<grub/video.h>'.
(grub_multiboot_boot): Switch to text mode before calling
grub_relocator32_boot().
* loader/i386/pc/chainloader.c: Include `<grub/video.h>'.
(grub_chainloader_boot): Switch to text mode before calling
grub_chainloader_real_boot().
Unit testing framework for GRUB.
* Makefile.in: Test framework build rules for 'make check'.
* conf/tests.rmk: Build rules for individual tests and framework.
* include/grub/test.h: Header file for whitebox tests.
* tests/lib/functional_test.c: Framework support for whitebox
functional tests.
* tests/lib/test.c: Common whitebox testing code for unit and
functional tests.
* tests/lib/unit_test.c: Framework support for whitebox unit
tests.
* tests/util/grub-shell-tester.in: Support utility for grub-script
tests.
* tests/util/grub-shell.in: Utility to execute grub-script
commands in a Qemu instance.
* tests/example_functional_test.c: Example whitebox functional
test.
* tests/example_grub_script_test.in: Example grub-script test.
* tests/example_scripted_test.in: Example scripted test.
* tests/example_unit_test.c: Example whitebox unit test.
