Fix issue #84, Remove module_setup from mbs module interface

modified:   core/io.sh
modified:   core/mbs-lib.sh
modified:   core/mbs-log.sh
modified:   ext/mbs-assert.sh
modified:   ext/mbs-data.sh
modified:   ext/mbs-do.sh
modified:   ext/mbs-func.sh
modified:   ext/mbs-git.sh
modified:   ext/mbs-mod.sh
modified:   ext/mbs-mpkg.sh