Fix issue #15, Standardize PRIVATE PUBLIC USER in core and ext

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

testing: reloaded mbs, ran mbs and post init queue completed okay