Mwlib

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- fix argument handling in mw-serve
Previously it had been possible to overwrite any file by passing
arguments containing newlines to mw-serve.

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- ensure that files extracted from zip files end up in the destination
directory.

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- fix for reference nodes
- allow most characters in urls
- fix for setting content-length in response
- fix problem with blacklisted templates creating preformatted nodes (630)
- do not split preformatted nodes on non-empty whitespace only lines
- do not create preformatted nodes inside li tags
- pull garbage out of table rows. fix 17.
- dont remove empty spans if an explicit size is given.
- uncomment fix_wikipedia_siteinfo and add pnb as interwiki link
- remove mwxml writer.
- add mw-version program

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- fix missing page case in get_page when looking for redirects
- some minor bugfixes

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- better compatibility with older mediawiki installations

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- fix status callbacks to pod partner