#100 Make it possible to remove authentifications

[Lastwebpage]

Hello,
I guess this is a very common mistake from beginners.
If I add a new friend there is this "sign key" option. Even though I read the documentation, I am not sure if this is needed or not. Later I maybe read articles that this is not necessary, have no function and in opposite, it's a bad choice to enable this option. (freezes, more CPU and RAM usage)
Unfortunately this is a one time option. It's impossible to revoke this sign later.
(I tried workarounds, like remove friends and re-add, or fiddle around in retroshare_public_keyring.gpg with WinPT, the sign stay)

Please add the possibility to remove this authentication.

Peter