Changes

Every table will contain some duplicate keys and erroneous entries. We're going to clean the companybase table so that every key (coname, statecode, datefirstinv) is unique. This means that there will be a 1:1 relationship between 1 key and 1 entry. Given an entry you will be able to create a unique key and given a coname, statecode, datefirstinv key you will be able to find exactly 1 entry that the key corresponds toin the companybase table set.