Detailed version

Now admin_info_files is an empty and dead table.
I started removing it entirely, but there is quite a bit of code to remove and probably now is a bit late.
Two options:
 1. do it and "hope",
 2. remove the scheduled task, deprecate everything else, and drop it in 1.1.

Forgot an xref to #707: once this is merged that issue should be fixed.