If the item is not to be preparsed but has enough meta, mark it as preparsed

* Fixes to the streaming chain generator
* network: don't print an error message for EINTR

which is superseded by the Unicode wrappers and GetFallbackEncoding

<subliminal message>
http://www.googlefight.com/index.php?lang=en_GB&word1=wxwidgets&word2=qt
</subliminal>

Hopefully fix linking on Windows and Mac OS X.

But given how badly broken the plugin is (interaction stuff),
you'd better not use it anyway.