* Gmagick has never had a non-beta release
* mqseries has never had a stable release
* Warn that recode extension is unmaintained
* rnp has never had a stable release.
* stats extension is unmaintained
* svn extension was already marked experimental in text
* Windows DLLs are available now for xdiff
* svm has never had a stable release
* Mark zmq experimental/unmaintained, and actually connect install section
* Fix reference to installation section for zmq that moved
* parle has never had a stable release
* Mark ui as experimental, clean up intro slightly
* Add text warning that Imagick is still considered experimental
* Fix Status/State mix-up, and regenerate appendices/extensions.xml
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