*.rda files in a package's data
subdirectory and replaces them with a lazy load database.
makeLLDB(packageDir, compress = TRUE)TRUE, compress the resulting lazy database.*.rda files) after creating the lazy database.
We needed this because we want the meta data packages to have lazy
load symantics for the data objects. Users should be able to load a
data package using require and then ask for any of the data
environments by name. We want lazy loading of these data sets because
they tend to contain large environments which would take a long time
to load if we did it at attach time.