clean up case_study_water_sources.csv

delete case_study_water_sources.csv

Data files with updated filenames

Merge pull request #252 from NREL/change_data_file_names

change uv data input filename

change data filename,add default unit_param values

change Cl input filename, fix calc for input dose

change chemical_addition input filename

add Cl dose to results printout

change constituent_removal input filename

change basis, electricity_costs input filename

change water_recovery input filename

delete old data files

change basic_unit.csv filename in cost_curves

remove basic_unit.csv