control the insertion behavior of new groups

[mhh008]

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When edding new groups, they are always added at the end. So it is not possible to have a customised order of the groups.

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• per default: Append the new group at the end, like happens at the moment with version 1.0.3
• Add CLI Parameter option to specify the position of the new group
  • e.g. there are 3 groups existing: a b c and you want to add group d and give as cli option the number 2
  • expected result: a d b c
  • behavior: new group comes to the specified position, counting starts with 1 (thats more user friendly for non programmers), then the old groups follow. So with number 2 the new group gets inserted between the first and second already existing groups.

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