Revamped main.f90: land_lake => Update_Cell
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Added MODULE_VARIABLES_OLD.f90
Separated the variables into an old and new module
Removed all references to MODULE_VARIABLE_OLD.f90 from main.f90
Changed sumflx to structure input
Changed sumflx to structure input
Finished up converting arguments to structures in main.f90
Renamed main.f90 to TOPLATS_DRIVER.f90
Fixed the makefile for the new model driver
Added the program name to the driver
Added tests for calcrain and calcrsoil