Redesiging to allow for more user customization. Put variable values in dictionaries for easy editing by user through text interface. Text interface not complete. Need to modify functions df and solve so that they look up variables in the dictionaries. There are 3 dictionaries, one for the value of the variable, one for a string with the units, and one for the name of the variable. Also wrote a generalized function, getVal, which takes in a name, unit string, and old value for a specific variable, queries the user for a new value for that variable, and returns the user specified value if it is valid (otherwise returns the default val).