Import series: add support for Scott catalog numbers

[0pdd]

The puzzle 694-8e1ac4c4 from #694 has to be resolved:

mystamps/src/main/java/ru/mystamps/web/controller/dto/ImportSeriesForm.java

Line 89 in 712c623

// @todo #694 Import series: add support for Scott catalog numbers

The puzzle was created by Slava Semushin on 08-Jul-18.