#### dot-column-interface

Groups dot objects so they form a column, and position dots so they do not clash with staff lines

##### User settable properties:

`direction` (direction)
  Up or down, left or right?

##### Internal properties:

`positioning-done` (boolean)
  Used to signal that a positioning element did its job. This ensures that a positioning is only done once.
`stem` (layout object)
  pointer to Stem object.

This grob interface is used in the following graphical objects: DotColumn

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