[TYPO3-project-4-3] saltedpasswords for v4.3

[Steffen Ritter]

Steffen Kamper schrieb:
> this means extension doesn't auth, and of coarse doesn't update 
> password. I didn't encountered why.

In a discussion with Steffen via Skype we turned out that 
saltedpasswords was not activated for be, since he does not use rsaauth.

Marcus Krause and me once decided not to allow plain transmit of 
BE-Passwords, which would be needed for saltedpasswords without RSA.

This is why saltedpasswords is not activated for backend purposes when 
loginlevel is superchallenged (won't work anyways) or normal (because of 
security reasons).

Steffen and me (it's like Steffen²) came over to use a userfunc in 
ExtMgm checking this, and make the user really clear by a message if 
saltedpasswords is activated in be or why not exlpaining the reasons to 
users who are not into the topic. So that they know what to do do let it 
work.

regards

Steffen