[rfc][icedtea-web][itweb-settings] Improve Icedtea-Web cache disk space

[helpcrypto helpcrypto]

Now it works. My humble opinion about the patch:

The spinner works great...this seem to be a good approach.

Limit cache size checkbox should be before the text/spinner.

Why available>maximum?
Can maximum be rounded to MB?

I dont like "colored text" very much: people with dissabilities/color blind
could even confuse them.
Why orange?...I understand the red, but why 32MB is orange? (btw, I cannot
CLEARLY see it [Im one of those])

The default window is smaller and a scrollbar appears.


In general, I dont like the GUI/layout, what about something like:

Temporary Internet Files
Java stores application data for faster execution the next time you run it
Limit cache size: <spinner> MB (0=dont cache)  [all the following disabled
if limit is = 0]
    [show warning here when needed]
Compresion level <select>
Location <change>
<view files>
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