Annotate status and interaction level for a group of people

Interactive annotation of status and interaction level for a group of people (asked from Anna Sieben). The set status is valid until the next status is set. The interaction level of each person should be marked by color so that groups can be visualized. The same group type (interaction level) can be present to the same time (e.g. visualized by different brightness levels of the same hue). It should be possible to add a person to an existing group.