| git_stamp | Get git stamp (commit and branch) for a repository | 
| InstallOldPackages | Install old versions of R packages. | 
| LoadandCite | Install, load, and cite R packages | 
| 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_data | Load plain-text data and RData from a URL (either http or https) | 
| source_DropboxData | No longer supported | 
| source_XlsxData | Download an Excel data set |