Finished User Story 2.  Added code to IsValidAccountNumber() to calculate the checksum.  TestIsValidAccountNumber() now succeeds.  Split that test valid and invalid cases.  Also added a second test to validate a different account number.  Modified OCRConvert main to call IsValidAccountNumber() on the parsed account number.  Modified ReadFile() to always pad the line read out to 27 characters.  This was necessary to get around the editor stripping of trailing whitespace.  Added additional account number to OCRFile2.txt.