[fyi][icedtea-web] backend and itw-settings for extended applets security

[helpcrypto helpcrypto]

Thanks Jiri for showing me the image on the wiki, with the current
state of the art.
    http://icedtea.classpath.org/wiki/Image:ExtendedAppletsSecuritySettings.png

IMO, it fits any need and looks promissing, but seems to be a little
complex to end-users.

Do we really need so many columns and buttons?
Do we need a invert selection?
Delete selected?
To move rows?...

Would something simpler, like:
    http://www.practice-labs.com/support/images/pop-up-support/chrome-advanced-settings-privacy-content-exceptions.png
will be enough?

Anyhow, ill love to use, and will use it, for sure!