Simple emulator for DBS3. Incomplete.
Adapt to full lumi list returned in maskedBlocks
New tests for lumi masks, remove existing which fails with DBS2 emulator
Switch to real DBS, not emulator. Switch to a smaller RAW dataset
Update DBS3Reader Map
Merge pull request #5132 from ericvaandering/lumilist_and_dbs3

Add lumiMask to masked blocks, fix unit tests for DBS3