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in not null
removed unused imports
added thread safety for GDBB

refactored some code
added some more safety
Mac distributable for alpha-10 added
FVA implemented in GurobiQuadraticSolver
FBA uses FVA by default

Debugging
QuadraticIPoptSolver FVA implemented
starting point for FVA implemented for Ipopt to improve speed
IPoptSolver no longer used Hessian Approximation for FVA
Imports required to run main added, commented out