Preliminary version with support for ordinal outcomes

postMCMCglmm code as used for:

Huynh, T. N., Kleerup, E. C., Wiley, J. F., Savitsky, T. D., Guse, D., Garber, B. J., & Wenger, N. S. (2013). The frequency and cost of treatment perceived to be futile in critical care. JAMA internal medicine, 173(20), 1887-1894.