Add script to "undo" account merges
Add script to "undo" account merges

- Only covers a few fields (the ones we needed to undo a certain bad merge)
- Room booking needs to be checked manually (not handled at all so far)

ThiefMaster/indico,indico/indico,mvidalgarcia/indico,DirkHoffmann/indico,mvidalgarcia/indico,mvidalgarcia/indico,OmeGak/indico,pferreir/indico,OmeGak/indico,pferreir/indico,DirkHoffmann/indico,indico/indico,ThiefMaster/indico,DirkHoffmann/indico,DirkHoffmann/indico,pferreir/indico,OmeGak/indico,mvidalgarcia/indico,ThiefMaster/indico,OmeGak/indico,ThiefMaster/indico,mic4ael/indico,mic4ael/indico,indico/indico,mic4ael/indico,mic4ael/indico,indico/indico,pferreir/indico