productionFuncDefault: Production Function
In HelenKettle/microPop: Modelling Microbial Populations

Production rate of resource (units are resource mass/time)

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productionFuncDefault(strainName, groupName, pathName, varName, all.substrates,
  keyResName, stoichiom, products, bio.products, uptake, growthRate, yield,
  parms, water)

`strainName`	Name of the strain that is being looped through in the ODE solver
`groupName`	Name of microbial group that is being looped through in the ODE solver
`pathName`	Name of metabolic path (e.g. path1) that is being looped through in the ODE solver
`varName`	(string). Calculate production of this variable
`all.substrates`	Vector of strings giving the names of the all the substrates used on this pathway
`keyResName`	(string). Name of the key resource on this pathway
`stoichiom`	Named vector (names are resourceNames) giving the mass of each resource in the stoichiometry i.e. molar mass of resource multiplied by the number of moles in the stoichiometry
`products`	Vector of strings giving the names of the all the metabolic products created on this pathway
`bio.products`	Vector of strings giving the names of the all the microbial products created on this pathway
`uptake`	Vector with names given by resourceNames which given mass uptake of each resource per unit time
`growthRate`	(scalar) microbial growth rate (mass per unit time) on the given pathway
`yield`	Named vector (names are resourceNames) giving the mass yield of biomass on each resource (mass microbe/mass resource)
`parms`	List containing all system parameters
`water`	Name of resource with Rtype 'Sw' - i.e resource could be called 'water' or 'H2O' etc