RavenDB-2955 delete unused auto indexes
RavenDB-2912 Improve merge indexes process in the UI
Move unsupported DTC detection to when the transaction enlistment is created
Merge branch 'RavenDB_2912' of https://github.com/ml054/ravendb
Can get a proper error if trying to use Voron & DTC
Slow documents count will generate properly on Esent.
Merge branch 'master' of github.com:ayende/ravendb