fixes #3 by checking Half Edge Handle validity on circulator creation
fixes #3 by checking Half Edge Handle validity on circulator creation

ColinGilbert/noobwerkz-engine,ColinGilbert/noobwerkz-engine,ColinGilbert/noobwerkz-engine,ColinGilbert/noobwerkz-engine,ColinGilbert/noobwerkz-engine,ColinGilbert/noobwerkz-engine,ColinGilbert/noobwerkz-engine,ColinGilbert/noobwerkz-engine