New function, zfold() creates a reordered wrapper around
any function, which is useful for reordering S3 functions.
Various minor fixes to documentation and website.
Document "_PACKAGE" rather than NULL to fix recently discovered issue with roxygen2 package docs.
New wrapper for estimating poisson models (through glm), meaning that built-in wrappers now include lm, glm, logit, probit and poisson models.
Documentation web site.