Handle non-integer Field Origin values in analyzer

[nholik]

Labelary and printers are able t accept non-integer FO (Field Origin) inputs, but this library sets non-integer values to zero. If the provided values are valid decimals, it should be acceptable for the library to convert to an integer if it falls in range. I am submitting a pull request for consideration. I believe that loosening the analyzer in this manner is better than forcing to zero.