Add Transaction support to POST/PUT/DELETE operations on .xml representations of configured data sources. Define UseTransactions: true, under each POST/PUT/DELETE method in restcfg.json that you want to use transactions for. Depends on FDO provider support, which the user is assumed to check up front before making the decision. Fixes #19
Add transaction support to CUD routes in REST API. We check if _MgRestUseTransaction = 1 in the resource header to determine whether to use transactions or not. Test suite as been added to exercise transaction support.