xlsx with list of files to be uploaded

[umed]

File may include such columns in presented order:

• [ ] Path to file or folder to be uploaded
• [x] Unique prefix for file (or files in folder)
• [x] Optionally could be specified new name if file path specified
• [ ] Option to specify recreating table or inserting new rows

[umed]

Moving to v0.3, part of items fixed for v0.2 in #14