Calculate need function almost complete

> In InsertTestData, volume and rate still need to be defined
> In CreateHardwareLayout, self.universalRate still needs to be defined
> In CreateFlowerbedsLayout, self.universalVolume still needs to be
defined
>In GetReadingsTemp, universalCost still needs to be defined
broken but fix it soon
Calculate need and insert readings after

> Calculate need completed
> Insert readings after just needs to have a modify sql statement to be
completed
Un-commented out 2 lines
Constants for cost, volume, amount improved