typedefs for better gcc compatibility
typedefs for better gcc compatibility

tjolsen/chrono,dariomangoni/chrono,PedroTrujilloV/chrono,armanpazouki/chrono,amelmquist/chrono,jcmadsen/chrono,projectchrono/chrono,jcmadsen/chrono,armanpazouki/chrono,Bryan-Peterson/chrono,jcmadsen/chrono,amelmquist/chrono,rserban/chrono,andrewseidl/chrono,jcmadsen/chrono,amelmquist/chrono,rserban/chrono,PedroTrujilloV/chrono,Milad-Rakhsha/chrono,armanpazouki/chrono,rserban/chrono,hsu/chrono,Milad-Rakhsha/chrono,andrewseidl/chrono,andrewseidl/chrono,Milad-Rakhsha/chrono,Bryan-Peterson/chrono,Bryan-Peterson/chrono,armanpazouki/chrono,dariomangoni/chrono,projectchrono/chrono,PedroTrujilloV/chrono,projectchrono/chrono,projectchrono/chrono,dariomangoni/chrono,jcmadsen/chrono,amelmquist/chrono,Milad-Rakhsha/chrono,Bryan-Peterson/chrono,rserban/chrono,andrewseidl/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,tjolsen/chrono,hsu/chrono,rserban/chrono,PedroTrujilloV/chrono,hsu/chrono,PedroTrujilloV/chrono,dariomangoni/chrono,hsu/chrono,amelmquist/chrono,rserban/chrono,tjolsen/chrono,tjolsen/chrono,Bryan-Peterson/chrono,andrewseidl/chrono,hsu/chrono,projectchrono/chrono,jcmadsen/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,amelmquist/chrono,armanpazouki/chrono,dariomangoni/chrono,tjolsen/chrono,armanpazouki/chrono,dariomangoni/chrono,rserban/chrono