[rfc][icedtea-web][policyeditor] File Changed check

[Andrew Azores]

Hi,

As promised, here's a patch that lets PolicyEditor detect when the 
policy file has been externally modified since it was opened, using 
MD5SumWatcher.

ChangeLog:
Added check for external file modification to PolicyEditor
* netx/net/sourceforge/jnlp/resources/Messages.properties: (PEFileModified,
PEFileModifiedDetail) new messages
* netx/net/sourceforge/jnlp/security/policyeditor/PolicyEditor.java:
(updateCheckboxes) avoid NPE. (openAndParsePolicyFile, savePolicyFile) use
MD5SumWatcher to detect when the policy file has been externally modified.
(updateMd5WithDialog) new method
* 
tests/netx/unit/net/sourceforge/jnlp/security/policyeditor/PolicyEditorTest.java:
all URLs changed to example.com

Thanks,

-- 
Andrew A

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