Fix "@-" which has apparently been broken for some time.  <sigh> While I'm here, add in a lot more error-checking around append_archive.
Fix "@-" which has apparently been broken for some time.  <sigh>
While I'm here, add in a lot more error-checking around append_archive.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase