block range fixes (#318)
block range fixes (#318)

* block range fixes

* Comment getBlockRangeSteppedSummary

RogueElement/dcrdata,dcrdata/dcrdata,dcrdata/dcrdata,dcrdata/dcrdata,RogueElement/dcrdata,dcrdata/dcrdata,RogueElement/dcrdata,RogueElement/dcrdata,dcrdata/dcrdata