Department of Computer Science and Automation, Indian Institute of Science, Bangalore, 560012, India. nithin@csa.iisc.ernet.in.|Department of Computer Science and Automation, Indian Institute of Science, Bangalore, 560012, India.|Department of Biochemistry, Indian Institute of Science, Bangalore, 560012, India.|Department of Biochemistry, Indian Institute of Science, Bangalore, 560012, India.|Department of Computer Science and Automation, and Supercomputer Education and Research Centre, Indian Institute of Science, Bangalore, 560012, India. vijayn@csa.iisc.ernet.in.