Revert "fai/config/scripts/EDU/50-cups-browsing: Assure that CreateRemoteCUPSPrinterQueues is set to 'Yes'."

This reverts commit c07b8a4e.

fai/config/package_config/STANDARD: python{,-minimal} are virtual, let's use python3{,-minimal} instead.

bin/debian-edu-faiinstall: Obviously 'test -d' is true for symlinks that point to a directory. In that case, we need to be more precise.

fai/config/files/etc/security/group.conf/: Use same group.conf for the WORKSTATION and ROAMING_WORKSTATION class. Duplicate that file.

bin/debian-edu-faiinstall: Create .ipxe file as ltsp.ipxe first, then create a symlink 'debian-edu-fai.ipxe' to reflect that this is not LTSP but FAI.

bin/debian-edu-faiinstall: Adjust installation of TFTP configuration files. Place files into /srv/tftp/ltsp to match Debian Edu 11 LDAP/DHCP settings.

fai/config/files/etc/security/: Ship PAM group.conf for WORKSTATION class. LDAP users should be members of several system groups on networked WORKSTATIONs.

fai/config/class: Rename debian-edu.profile and start the filename with z<nn>_... Also split out FAI Inventory and FAI Sysinfo.

fai/config/debconf/EDU: Stop using debian-edu-server.crt as ldap-cacertfile, use ca-certificates.crt instead.

class/debian-edu.profile: Fine-tune debian-edu.profile so that it fits into the FAI menu dialog box.

class/debian-edu.profile: Rewrite profiles, drop BIOS legacy profiles (now covered by GPT partition table layouts that can handle UEFI and BIOS installations).

fai/config/scripts/ROAMING_WORKSTATION/80-fix-ldap-access: Use Debian Edu's rootCA certificat for connecting to LDAP.

scripts/EDU/98-drop-fai-aptproxy: Drop script. It is actually quite recommendable keeping the FAI proxy (it might be optimized for APT package downloading).

scripts/EDU/50-cups-browsing: Adapted to Debian Edu 11, modify cups-browsed-debian-edu.conf instead of cups-browsed.conf.