[rfc][icedtea-web] offline support

[Jiri Vanek]

Hi!

Attached patch is making ITW run offline. Id so good that even applets works offline :) And It was 
much more simpel then I expect... And that makes me feel wrong. Except offline support it is adding 
new switch -Xoffline - this is forcing offline behaviour.

The patch is straight forward:
  - if Xoffline is specified, ITW do no network connection and relay on cached ittems
   - if Xoffline is specified, the allow-offline=fals eis ignored
if not...
  - before it attempts to make any download,  connection is tested. If it is recognized as offline, 
it behaves as if Xofline is set for next conenctions. file:// protocol should be exception
as a result
  - the desktop icon is finally made as "javaws url" and not "javaws path/to/file/in/cache"
As side effect (the only change in logic)
  - the initial jnlp is downloaded via resource tracker, and not via url.openStream()


Paralle with -Xoffline I wonted to add something like Xkeepall, which's target was to dont clean 
cache after shutdown (and so make larger base of possible-to-offline applications) however I have 
not found usage for this flag:-/

The leading code was CacheUtil.cleanCache, which is making some complicated decisions whether to 
delete file. I have not found  case when keep all should be usefull. (?????)

Does anybody reacll why
              * FIXME: if cacheDir is for example $USER_HOME and they have a folder called http
              * and/or https. These would get removed.
              */
             remove.add(cacheDir + File.separator + "http");
             remove.add(cacheDir + File.separator + "https");

do exists?


Best regards from CZ
   J.
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