removed transmission query from generate reports
added to_s methods for models
added method to find unique key values in hash
corrected mode and added spot_value to sample data
moved sample data to report_tests and added method for getting transmissions summary
added hash selector proc as parameter to distinct values method
changed method to self and added methods for getting stations/fillers for transmissions
added methods to get stations/fillers from transmissions summaries
basic report 3a data generation
populate previous period data into report