made the debug log do something
added some more debug messages
implemented some basic gpg encryption
fixed a probably long standing bug where the returner failed if the function had no arguments
made the rest of the dict accesses use .get, even if they are not optional like args
clarify the documentation a bit
made gpg a soft dependency, clarified documentation
removed the '_return' suffix
no other returner but the mongo_returner (which will soon be replaced by mongo_future_return which does not use the suffix, too) uses this suffix
Merge pull request #9832 from danieljn/smtp_return

Some fixes and the addition of GnuPG to smtp_return