[#1684] Add verbose rsync and fix production download page.


Problem description
===================

It all started due too missing download files from download page.

Looking at the buildbot logs, I can not see what files were uploaded since rsync was not verbose.

Later I discovered that the problem is not rsync, but the script for creating the download page, which was linking to files from staging.

In the past, it used to work, since before a release, I was always releasing on staging.

This time I made a release without staging and then I got into problems.


Changes description
===================

Add verbose rsync for uploading documentation and download files.

Maybe in the future we would like to turn off verbose for documentation...

Creation of download page was fixed to use input argument instead of branch name for deciding if we want production or staging.


How to try and test the changes
===============================

reviewers @alibotean 

This is just to let you know about the changes.

Thanks!