The deltacloudc command line tool is being deprecated. For now the code making up deltacloudc has been moved to the /deltacloud/clients/console directory but will ultimately be removed from the repo. If the command line client is important to you then please let us know. A new command line client may be put onto the roadmap if there is demand for one.
The deltacloud core developers use (almost exclusively) cURL as a command line client for working with a deltacloud server. You can find more information on working with cURL against deltacloud here.