Cleaned up segments' extended command menu.

Example:

    Red Example Score (2013) - segments

        1: segment 01
        2: segment 02
        3: segment 03

        all pdfs - make (mm)
        all pdfs - save (ss)
        all pdfs - view (vv)

        new segment (new)

        list (ls)

        initializer module - boilerplate (inbp)
        initializer module - remove (inrm)
        initializer module - stub (ins)
        initializer module - view (inv)

        metadata - add (mda)
        metadata - get (mdg)
        metadata - remove (mdrm)

        metadata module - remove (mdmrm)
        metadata module - rewrite (mdmrw)
        metadata module - view (mdmv)

        views - list (vwl)
        views - new (vwn)
        views - select (vws)

        views module - remove (vwmrm)
        views module - view (vwmv)

    >