Improve or drop aggregateResultMatrix

[WesIngwersen]

https://github.com/USEPA/useeior/blob/636a81b3f6a806a6c3b1d50f62c0cc4de977b9fe/R/CalculationFunctions.R#L417

correct usage would be for example, with model being a model object already built and assume model is a summary level model (would also work for detail)

A_d_sector <- aggregateResultMatrix(model$A_d, "Sector", model$crosswalk)

But this is not well documented, no examples are given and inconsistent with other functions like adjustResultMatrixPrice() where one specifies the matrix like A_d and not having to pass model$A_d. and also having to pass the whole model$crosswalk is odd and then not clear what matrices can be passed... docs say "result matrix" but this actually fails for what are called result matrices like M and N that are not sector x sector.

[bl-young]

I've clarified the descriptions for this and aggregateResultMatrixbyRow() in a61fc47. One is designed to aggregate a result matrix (G or H) while the other is to aggregate a sector by sector result such as what comes out of calculateSectorPurchasedbySectorSourcedImpact()