#109 QR code populate_grid parameter naming issue (minor)

[Daniel Gredler]

The QR Code source code contains two data stream variables: datastream and fullstream. One contains ECC data, the other does not. The call to the populate_grid function passes fullstream as the 3rd parameter, but the parameter name inside the method is datastream, giving a false impression of the variable that is being used and the data which it represents. I think this third parameter in the populate_grid function should be renamed to fullstream to accurately reflect its meaning and to be consistent with the rest of the QR Code source code conventions.

[Daniel Gredler]

By extension, the same should probably happen in the cwbit function (for the name of the first parameter).

[Harald Oehlmann]

Thank you. Both committed by [7141e2]