Disable upload of entire new folders.

It requires to upload file one-by-one. At least in this version.

re #6176
Improve the way we process information from server

re #6176
Get the pub_date from the upload

The upload server now provides the pub_date of the file inside its local
folder. This allows ScriptRepository to correctly identifies the status
of the uploaded files.

re #6176
Merge branch 'feature/6176_upload_scripts' into develop