Fixed various bugs:

* Iterate over Merged Doc DataSource better so you can edit recipient list
  in word to select entries, and Attachment Mailer will only act on those.
* Work around OLEbadness by assuming header is data, and hoping OLE will
  assume everything is string.
* Added progress bars, and some more error messages/error handling.
* Added some prompts so you know when to switch to other programs.