userinfo::loginUser now throws exceptions on failure, webservice code
 will need to be adapted to take them into account as well

issue #6001

issue #5919

At least useful for webservice

issue #5807

There are some left in datepicker.js because of a bug in the sniffer,
 I did not find a way to fix that yet.

issue #5690

Signed-off-by: Benoit Mortier <benoit.mortier@opensides.be>

Signed-off-by: Benoit Mortier <benoit.mortier@opensides.be>