newRollUp and createSubset need to apply costMultiplier updates

[ryankwagner]

newRollUp has an input field called costMultiplier, but the logic to apply this to its generated rollup isn't present. Need to create logic to do this.
Following:

def newRollUp(...
                , costMultiplier: Option[BigDecimal] = None
                ...
               ) : FactBuilder = {

Applies as such:

tableMap = tableMap +
        (name -> new FactTable(
          ...
          , fromTable.costMultiplierMap
          ...
      ))
      this

And should include this extra logic:

val remappedMultiplier: Map[RequestType, CostMultiplier] =
        fromTable.costMultiplierMap.map(f => (
          f._1 -> {
            val adjustedLRL: LongRangeLookup[BigDecimal] = LongRangeLookup(f._2.rows.list.map(row => (row._1, row._2 * costMultiplier.getOrElse(1))))
            CostMultiplier(adjustedLRL)
          }
          )
        )

Or similar.

[ryankwagner]

Referenced here:
#769

[ryankwagner]

@patelh @pranavbhole

Please comment if you see anything that looks strange or anything that should be added. Also please add in anybody else who would find clear use from looking at this.