package__init(): improve error message

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
config-install: fix USAGE

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Release 0.8

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>