[ZODB-Dev] Heads up on some clean ups

[Jim Fulton]

I'm getting rid of the DB and Connection synch and mvcc options in  
open().  These were a bit silly (be stupid options) and complicated  
the code.  AFAICT, they are only used by tests and I've re-factored  
the the relevant tests to not use them.

In the course of doing this, I noticed that subtransactions were  
supposed to go away in 3.7, so I'm finally removing subtransaction  
support. :) Use savepoints instead.

Jim

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