[RFC] Added javawebstart.version property to netx

[Man Wong]

The attached patch adds javawebstart.version as a system property whenever a 
jnlp file is being launched. It also gives the user the permission to read that 
property when working under sandbox permission. This fixes icedtea bug 486.
Even though bug 486 says there is a problem with the encoding support. However,
after add the encoding support, the file could not be launched because the
above permission was denied. 

Should I file a separate bug for the permission issue, or can I just mention
that as part of bug 486?

Any comments?

Thanks,
Man Lung Wong
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