This is an internally called function used to fits a
linear mixed-effects model; see
Thiago de Paula Oliveira, firstname.lastname@example.org
Laird, N.M. and Ware, J.H. (1982) Random-Effects Models for Longitudinal Data, Biometrics, 38, 963–974.
Pinheiro, J.C. and Bates., D.M. (1996) Unconstrained Parametrizations for Variance-Covariance Matrices, Statistics and Computing, 6, 289–296.
Pinheiro, J.C., and Bates, D.M. (2000) Mixed-Effects Models in S and S-PLUS, Springer.
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