H_rate: Function to solve for harvest(exploitation) rate of a fleet...
In mcoshima/moMSE: Functions for Running a Management Strategy Evaluation

Function to solve for harvest(exploitation) rate of a fleet based on catch for that year

1	H_rate(catch, fleet, N, year, dat.list, total.catch = F, biomass = T)

`catch`	the expected catch from fleet for the year (in units of the fleet)
`fleet`	fleet you are calculating F for
`N`	matrix of numbers-at-age, first column is year
`year`	year index
`dat.list`	list including M, Nages, weight-at-age, and selectivity
`total.catch`	is the projected catch a combined catch (T) or only for that fleet (F)
`biomass`	calculate harvest rate from catch in biomass (T, default) or catch in numbers (F)