remove call to debugger
Make referenced objects work correctly

Specifically, an object returned without setting the 'include' attribute on
the code should at most cause another roundtrip, but not die with an
obscure error somewhat later.
Implement basic backref support

rudimentary and completely broken:
* the server gets an object, not its key, so it'll find the obj in the
  database unnecessarily
* no client.side caching
  which may be a good thing for 1000-item 1:* relationships,
  but not in general
Use AMQP_HOST envvar for testing

and remove superfluous setting of the host in the test suite
Create a "local" transport that's usable in non-test situations
rename SECRET to SECRET_KEY
int vs. long
actually define NoData / ManyData exceptions
Use "simple" encoding for lists, if possible
import cleanup
codec requires an environment
spurious debugging
import and left-from-copying code cleanup
+attrdict
Add a thread-specific array of cleanup functions

no registry code, just append to the array for now
add codec support for attrdict
add obj_find support to SQL

don't publish find() and get() methods:
the client is supposed to call main code instead