Added some more error checking.  Also, documented the auxiliary outputs that are not shown in the help diagram: key pairs, and the EE cert that is embedded in the manifest.
Added some more error checking.  Also, documented the auxiliary outputs that are not shown in the help diagram: key pairs, and the EE cert that is embedded in the manifest.

rhansen/rpstir,rhansen/rpstir,rhansen/rpstir,rhansen/rpstir,rhansen/rpstir