[rfc] [icedtea-web] applets are more error reporting to user

[Jiri Vanek]

This small patch (yah, fix itself have just one line) is adding visual experience to user if his applet fatally fails.

You can see nice example in one of our testcases  - http://www.knuddels.de:8080/index.html?v=90aez&c=7

I'm working on mechanism how to show much more errors by this way, but it will net native support on plugin side, so I'm waiting to Deepak with it.

The included  testcase I'm using for manual tracking of various exceptions. Imho I would like to push it and so do not need to keep ii in mind that it is somewhere on local drive.

Thanx for any comments !
//to be honest hoping for direct approve :)

    J.


2012-11-23  Jiri Vanek <jvanek at redhat.com>

	Better error reporting from applets
	* netx/net/sourceforge/jnlp/NetxPanel.java: (init) ErrorSplash is shown
	if fatal exception is cought
	* plugin/icedteanp/java/sun/applet/PluginAppletViewer.java: (replaceSpalsh)
	is rather removing all then just its previous version
	* tests/reproducers/simple/AppletTest/srcs/AppletErrorTest.java:
	* tests/reproducers/simple/AppletTest/resources/errorAppletAutoTests.html
	Testcase for manual testing of various exceptions from applet
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