added code to remove old selections rect if any exist - all tests passing
added code to remove old selections rect if any exist - all tests passing

BioInf-Wuerzburg/AliTV,BioInf-Wuerzburg/AliTV,BioInf-Wuerzburg/AliTV,BioInf-Wuerzburg/AliTV,BioInf-Wuerzburg/AliTV,AliTVTeam/AliTV,AliTVTeam/AliTV,BioInf-Wuerzburg/AliTV