Link MPI for static target.
Merge branch 'cmaes-restart' of github.com:chrisdembia/simbody into cmaes-restart
Cherry picking lambda->popsize.
[cmaes] Clarify comment about lambda.

Conflicts:
	SimTKmath/Optimizers/src/CMAESOptimizer.cpp
[cmaes] sigma -> init_stepsize.
[cames] sigma -> init_stepsize.
[cmaes] lambda -> popsize.