Generalized (k) to work anywhere in score.

Use the (k) command to visit the makers directory at any time while
working on a score.

MILESTONE: all score navigation commands are generalized to work anywhere in
score. These are the seven score navigation commands:

    Red Example Score (2013)

        build (u)
        distribution (d)
        makers (k)
        materials (m)
        segments (g)
        setup (p)
        stylesheets (y)

    > q