closes#186, stop translators from hanging
when a document loads inside a frameset, we now check whether we can scrape each individual frame.
all functions involving tabs have been vastly simplified, because in the process of figuring this out, i discovered Firefox 2's new tab events.
if a translator throws an exception inside loadDocument(), doGet(), doPost(), or processDocuments(), a translate error message will appear, and the translator will not hang
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