Revision 1035986

Replicator DB: removed some restrictions from the default document update validation function and added some logging.

1) Now it's easier to replicate to the replicator DB and by default it's writable by any user
   (just like any user can POST to /_replicate/);

2) The logging in the document validation function allows us to see in the log, after a replication,
   why a document was not written to the target replicator DB.