[TYPO3-project-4-3] Relogin feature

[Steffen Kamper]

Hi,

on Monday i will do a bugfix session on the relogin feature.

As thinking about here are some additional points, please comment or 
complete

1) only show password field (user is known for relogin). If switched to 
other user, switch back to original user.
2) check for openId activated, if yes - deactivate.
3) general config to deactivate, eg when using own login mechanism
4) when sessionTimeout is too small, set it to at least 360
5) while relogin is shown, stop the timer

if you see a possibility for 2) to get it work from JS please let me know.

vg Steffen