Pretty-print LaTex lm, lme and glm tables

Generates a LaTex contrast table for lme, glm and lm models, with number of significant digits shown depending on standard deviation of the contrasts. Significant p-values can be shaded. Optionally suppresses p-values for (Intercept) because this is not a difference and tends to be grabbed as "nice p-value" by medical researches.

For lme and knitr/RMarkdown, see package dknitprintr.