Global optimizer recognizes constant variables.
Rosenbrock test in global optimization.
Add FreudenStein_Roth global optimizer test.
Add Beale global optimizer test.
Add Wood global optimizer test.
Adjust global optimizer test tolerance.
Add BraninRCOS global optimizer test.
Bug fix interval arithmetic.
Bug fix in pow function for intervals.
Add PowellSingular global optimizer test.
Performance improvements to global solver.
Global solver tests: Remove unused variables and set number of threads to 1.
Update readme.
Timing in fit gaussian example.
Benchmark with threads.
Global solver parallel.

Restriction of some parallel for loops to sizes larger than two
increased performance when no parallelism is possible.