added fva default tol

src/COBREXA.jl

@@ -26,7 +26,7 @@ include("banner.jl")
 _print_banner()
 
 # Constants
-const DEFAULT_FVA_TOL = 1e-6 # for numerical stability when doing FVA
+default_constants = (FVA_TOL = 1e-6)
 
 # autoloading
 const _inc(path...) = include(joinpath(path...))

src/analysis/flux_variability_analysis.jl

@@ -141,7 +141,7 @@ fva_max, fva_min = fva(model, biomass, optimizer; solver_attributes=atts)
 function flux_variability_analysis(
     model::StandardModel,
     optimizer;
-    optimum_bound = 1.0 - DEFAULT_FVA_TOL,
+    optimum_bound = 1.0 - default_constants.FVA_TOL,
     modifications = [(model, opt_model) -> nothing],
 )
     # Run FBA