[Fixed] transferring a structure to one on the admin list no longer adds
their name to the admin list again - mantis 4160
[Fixed] being able to add a name mutiple times to a structure permission
list
[Fixed] not being able to remove a name from a structure permission list
that is full - mantis 3208

Change-Id: I817f850ca17ffbd85f290128880577458f99cc0c