simulateBatchData: Create simulated batch data for testing.
In scristia/CNPBayes: Bayesian mixture models for copy number polymorphisms

Create simulated batch data for testing.

1	simulateBatchData(N = 2500, p, theta, sds, batch, zz, df = 10)

`N`	number of observations
`p`	a vector indicating probability of membership to each component
`theta`	a matrix of means. Columns are components and rows are batches.
`sds`	a matrix of standard deviations. Columns are components and rows are batches.
`batch`	a vector of labels indication from which batch each simulation should come from
`zz`	a vector indicating latent variable membership. Can be omitted.
`df`	length-1 numeric vector for the t-distribution degrees of freedom