[xgap] 5.11 Vertex Shapes

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# 5.11 Vertex Shapes

The following vertex shapes can appear in an interactive lattice:

- `circle`

  Subgroup is not normal in whole group.

- `diamond`

  Subgroup is normal in whole group.

- `rectangle`

  Subgroup has an index that is too big for automatic calculation of normality. So it is not yet known whether this group is normal.

  Automatic calculation is controlled by the following variable:

- `GGLLimitForIsNormalCalc V`

  Only for subgroups with index smaller than this number an automatic `IsNormal` test is performed when the vertex is added to the sheet.

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