Sergei Lemeshkin

In some files (*.xlsm - macros-enabled) workbooks relationship id contained in the attribute "relationships:id" instead of "r:id". So calamine cant read sheet data from these files. Example file (zipped): [issue221.zip](https://github.com/tafia/calamine/files/6663197/issue221.zip)

FIX: issue #64: removed issue #47 test due to breaking changes in tealeg/xlsx

1

Test for issue #47 not working because of breaking changes in xlsx lib used [https://github.com/tealeg/xlsx](https://github.com/tealeg/xlsx). Should rewrite issue #47 test further.

Numbers with some special formats reads as date

4

When user uses specific format for number, for example format "# ##0.00_ ;[Red]-# ##0.00\" (users love this format), this number will be read as date. This is because XfRk.String() reads...