update Conda yaml to use python 3.9 and no pip.. this was causing issues on Mac
update readme to be more intuitive for first time users
added functionality to allow for user_dem (Quantum 21' DEM)
added automatic creation of snow depth difference raster
fixed white box logic that was skipping entirely
Not fixed --> logic at the very very end of align script returned RETURN CODE 0 after successfully completing the run. Not sure what was happening there
Not fixed --> I have installed the binaries for WBT and think I could pretty easily write code to use that instead if IOT gets back that they don't want to update Kelvin