n, std_column)

 Load flux data (values and standard deviations for a single flux distribution) and map them to a model.

 o The data file must be in SBtab format
 o By default, reactions are mapped by comparing network.actions to the Reaction column in the flux file
   (this can be changed by using the optional function arguments reaction_field and reaction_column)
 o The values must be in a column Flux, Flux:Value, or Value
 o The standard deviations must be in a column StdDev, Flux:StdDev, or they are co