Possibility to make a complete backup of the project

[martin-hajek]

It would be useful to have the possibility to create a complete "backup" of the project in the online mode. At present, it is possible to separately download codes, segments, memos, log, but not the entire set. I suggest creating a button on the project screen that exports all the tables in csv format and zip them into one file. The button will be functional for a user with permission to change permissions, as it corresponds to the role of the project admin.