Update copyright year.
Merge branch 'master' of https://github.com/simbody/simbody
Merge branch 'master' of https://github.com/simbody/simbody
Per issue #157 and pr #159, dial down the gcc/clang optimization to -O2.
Also remove the -msse2 instruction set specification in favor of letting the compilers decide.
Merge pull request #160 from simbody/dialDownOptimizationToO2-issue157

Dial down gcc/clang optimization to O2