The source script or directory name. When a directory name is given, the
directory structure is preserved under an application specific private
directory ("\private\<uid>\") on the phone. A file called "default.py"
is required to exist on the root of the directory given. This will be
the main file that starts the application. (See option "--extrasdir"
below for more options for file placement.)
When a regular file name is given, it will be located under the
application specific private directory, with the name "default.py".