Reverting change to ChMatrix.h, atomic omp uncommented
Reverting change to ChMatrix.h, atomic omp uncommented

dariomangoni/chrono,armanpazouki/chrono,rserban/chrono,amelmquist/chrono,jcmadsen/chrono,andrewseidl/chrono,rserban/chrono,rserban/chrono,rserban/chrono,Milad-Rakhsha/chrono,armanpazouki/chrono,dariomangoni/chrono,amelmquist/chrono,dariomangoni/chrono,tjolsen/chrono,andrewseidl/chrono,jcmadsen/chrono,tjolsen/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,armanpazouki/chrono,amelmquist/chrono,projectchrono/chrono,jcmadsen/chrono,Milad-Rakhsha/chrono,amelmquist/chrono,tjolsen/chrono,andrewseidl/chrono,armanpazouki/chrono,projectchrono/chrono,dariomangoni/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,andrewseidl/chrono,dariomangoni/chrono,amelmquist/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,tjolsen/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,jcmadsen/chrono,tjolsen/chrono,armanpazouki/chrono,projectchrono/chrono,andrewseidl/chrono,jcmadsen/chrono,rserban/chrono,dariomangoni/chrono,rserban/chrono,amelmquist/chrono,armanpazouki/chrono,rserban/chrono