Changes to JSON servlet.  Should not affect existing javascript code.

- Functions that require database locks are now queued and executed whenever the lock becomes available.
- Added a 'replaceWithTransferredVCF' function (declared in JSONUtilitiesAdapter within Servlet, accessible via .../medsavant-json/client/medsavant/JSONUtilities/replaceWithTransferredVCF or with msInvoke javascript function using JSONUtilities as the adapter name).