Regarding feature request #3490114
I have added an "Export All" link outside of the #tableuserrights table. It has similar
behavior to the export links from each row of the mentioned table, except for the fact
that the pop-up window will now show all the privileges for all of the existing users.
I chose the position of the link to be on the same line with Check All / Uncheck All, but
I do not know if that is the most natural position it could fit in.