control the insertion behavior of new links

[mhh008]

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When edding entrys to an existing group, they get appended above existing links in that group.

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

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