.fop.xconf needed for building pdf.

The BRANCH parameter indicates that the target is a starterkit and
not a regular build for Sisyphus.

std-def is the default for the architectures on which it is available.

There are no more problems with firefox esr on aarch64.
This reverts commit 98f0735c.

Add multiple kernels support and initrd.img support instead full.cz.

Now you need to use engineering-install to install

- fix VM_SAVE_TARBALL parameter support
- grub: save ang read default menu item (thanks jqt4@, sin@)

1. Didn't work before because the variable was not exported.
2. Fixed the logic broken by the introduction of support for saving
the selected item on the FAT partition.

The code is given in accordance with the documentation
See-also: commit 2987fa8f

If the ISO image has a FAT partition and the image is written
to a flash drive, then it is possible to write to this partition
of the flash drive.
This is necessary, for example, if the user
does not want to install the system, but wants to constantly work
in LiveCD mode with or without recording sessions.
In order for this code to work, you need to make changes
to the FAT partition of the image on the flash drive:
Add the 1st line to the grub.cfg file:
set pfxfat=${prefix}
Write a 1kb file grubenv.
If grub.cfg contains a line like '^default=id',
then the read value is not used.

This prepares the ability to write and read
the default menu item from the grubenv file.
If grub.cfg contains a line like '^default=id',
then the read value is not used.
Setting the default menu item from the grubenv file
will be indented inside the 'if' optator and therefore
does not match the '^default' pattern.

- build-vm: Add ability to build .img.xz (thanks sem@)
- reports.mk: optimiztion for generate rpm and srpms lists (thanks mike@)
- reports.mk: generate targets.svgz instead targets.png
- add VM_SAVE_TARBALL parameter
- add MKIMAGE_PREFIX parameter
- kernel: optimization use/kernel/initrd-setup
- set STAGE1_INITRD_BOOTARGS in initrd-propagator
- slinux 9.1
- education 9.2

It is necessary to monitor the state of syslinux in Sisyphus.

education: use use/power/acpi instead of +power because this leads to a forced shutdown [distrtest-3933]

Previously, you had to specify two parameters MKIMAGE_PREFIX and
GLOBAL_PREFIX with the same value - the path to mkimage. And this
behavior has not been documented. The GLOBAL_PREFIX variable is
defined in mkimage in config.mk and rules.mk.

rtc not needed in initrd.

Not needed more. uuid assigned directly in configs.