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A general description is here.
‘agrep()’ gains a ‘fixed’ argument to optionally allow approximate regular expression matching, and a ‘costs’ argument to specify possibly different integer match costs for insertions, deletions and substitutions.
A package R code but without a ‘NAMESPACE’ file will have a default one created at ‘R CMD build’ or ‘R CMD INSTALL’ time, so all packages will be installed with namespaces. A consequence of this is that ‘.First.lib()’ functions need to be copied to ‘.onLoad()’ (usually) or ‘.onAttach()’. For the time being, if there is an auto-generated ‘NAMESPACE’ file and no ‘.onLoad()’ nor ‘.onAttach()’ function is found but ‘.First.lib()’ is, it will be run as the attach hook (unless the package one of a list of known exceptions, when it will be run as the load hook).