InstallOldPackages      Install old versions of R packages.
LoadandCite             Install, load, and cite R packages
git_stamp               Get git stamp (commit and branch) for a
                        repository
scan_https              Read a character text file from a secure
                        (https) site into R as a single object.
set_valid_wd            Sets valid working directory from vector of
                        possible directories
source_DropboxData      No longer supported
source_XlsxData         Download an Excel data set
source_data             Load plain-text data and RData from a URL
                        (either http or https)
