upload.sh: Fix default root folder setting | Fix parallel upload for recursive upload
upload.sh: Fix default root folder setting | Fix parallel upload for recursive upload

* Fine tune script logging, improve printCenter function.
* Only print new status line in parallel while loop.
* More generic fixes
* Fix processArguments function in case of empty folders
* Fix -i/--save-info flag when using parallel uploading

labbots/google-drive-upload