Move all the files in the "templates/submission" folder.

Rename the "submission" folder to "user". This folder only contains html
templates files related to the "submission" users.

Remove useless variable assignation and user r"" for special logger
string.

This page was useless, and slowing too much the interface and the
server. If we want to open an image for a donor in particular, open
first the donor page, then we can all the information we want for this
donor.

This change will offload the generation of the list of all application
related .js and .css files to python (based upon the content of the
'app' directory), and pass the full list, html formatted, to the jinja
renderer.

The 'enter' key on the username field should focus on the password
field, and not send the current form to validation.

This refactoring break if the QRcode is found, and try all page even if
an error accurs on one of the pages