Package installer-distro-simply-linux-stage3: Information

- stage3: Only require alterator-grub for arches that have grub.
- stage3: Drop dhcpcd.
- stage3: Drop installer-feature-setup-network-stage3.
- stage3: Drop installer-feature-nfs-client-stage3.

- 05-vm-profile.sh: fix "Setup 3 for workstation" case
  (alterator-vm would break given large enough disk
  when reading the broken autopartitioning scheme).

- stage3: Drop installer-feature-efi-stage3.
- cleanup: Drop unused define.
- stage3: Move installer step to installer-distro-simply-linux.
- cosmetic: Split long lines in description.
- all: Set license as GPLv2+.
- stage3: Drop services enabled/disabled lists.
- stage3: Drop installer-feature-symlinks-from-sbin.