[rfc][icedtea-web] adding support for http 511 authentication

[Jiri Vanek]

SSIA:)


Well, the patch is far from being finished, but I'm posting it there as proof of concept.

At first I enhanced our testserver to support 511 on on demand (name/passwd itw) (most of the work)
Once it was at least close to work, I implemented the reaction in itw. It was quite straightforward 
patch.

As a fallback, the direct interaction with browser will be implemented (as jeditropane is far from 
covering all possible html issues).


Also I need to test it on real proxies, If I will find no way how to use the modified tinnyhttserver 
for automated tests, it will probaby go away.

Also - one reformatting sneaked in. Sorry.

if you will ask why the skip choice, then - after is is tried several times, ITW swap to 
offlinemode. So if you dont wont to click yourself to death, you skip for session.


J.
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