prepare release

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>
[archiso] Merge cowspace_size= option in cowfile_size=

Since now cowspace_size == cowfile_size (only one file inside)

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>
[configs/releng] Always install needed pkgs from build.sh

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>