Remove openpyxl dependency for datamaps `import` command

Nothing wrong with it - just don't need most of it and we may get a performance increase in parsing the files without it.

This milestone relates to the first chunk of work being done, that of parsing the multiple spreadsheets selected for export to a master. This relates to the datamaps command import master -m.

No due date
0% Completed
#26 opened 2020-06-21 14:19:33 +00:00 by yulqen