lmulm_XTilde_VC(), lmulv_XTilde_VC():
Fixed address sanitizer issue with string comparison with pointer to
string literal.stvcGLMexact(), stvcGLMstack(): New
functions for spatially-temporally varying coefficients GLM.
posteriorPredict(): New functions for posterior
predictive inference using predictive stacking.
recoverGLMscale(): Utility for recovering posterior
samples of scale parameters in spatial and spatial-temporal
GLMs.