[rfc][icedtea-web] try to close before kill

[Jiri Vanek]

hi!

This patch is trying to sigquite process before kill it. It can solve some of the issues we have caused by ff/chrom* caches,safe modes, restoration mechanisms and similar stuff.

What do you think?

 From fixed applet patch it can be seen that it behaves much better now.

What do you think?


J.
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