sim_offspring: Simulate offspring
In ggcostoya/limon: Evolutionary Constraints among Thermal Performance Traits

Simulates offspring produced by an individual defined by some thermal-performance traits (TPTs).

1	sim_offspring(tpts, n_off, mu, sdm, cmtx, pmin, samples, error)

`tpts`	The individual's TPTs
`n_off`	The number of offspring to be generated by the individual
`mu`	The mutation probability (constant for all TPTs)
`sdm`	The percentage of the original TPT value that will act as the standard deviation of the normal distribution of mean = 0 from which the amount of change occuring on a mutating trait will be sampled.
`cmtx`	A genetic correlations matrix for the TPTs. This parameter is optional and CANNOT INCLUDE Pmin.
`pmin`	The percentage of Pmax corresponding to Pmin.
`samples`	The number of samples to be generated for each offspring.
`error`	The error to be introduced into the offspring's TPD in units of standard deviation of a normal distribution with 0 as mean.