Add group owner migration script.
Add group owner migration script.

sourcefabric/Booktype,ride90/Booktype,MiczFlor/Booktype,okffi/booktype,btat/Booktype,kronoscode/Booktype,eos87/Booktype,kronoscode/Booktype,MiczFlor/Booktype,okffi/booktype,sourcefabric/Booktype,danielhjames/Booktype,btat/Booktype,olegpshenichniy/Booktype,MiczFlor/Booktype,sourcefabric/Booktype,kronoscode/Booktype,btat/Booktype,eos87/Booktype,ride90/Booktype,rob-hills/Booktype,sourcefabric/Booktype,danielhjames/Booktype,olegpshenichniy/Booktype,kronoscode/Booktype,olegpshenichniy/Booktype,sourcefabric/Booktype,rob-hills/Booktype,okffi/booktype,olegpshenichniy/Booktype,olegpshenichniy/Booktype,rob-hills/Booktype,kronoscode/Booktype,aerkalov/Booktype,MiczFlor/Booktype,MiczFlor/Booktype,danielhjames/Booktype,ride90/Booktype,okffi/booktype,btat/Booktype,danielhjames/Booktype,okffi/booktype,ride90/Booktype,ride90/Booktype,aerkalov/Booktype,eos87/Booktype,eos87/Booktype,rob-hills/Booktype,danielhjames/Booktype,aerkalov/Booktype,eos87/Booktype