[libextractor] towards GNU libextractor 0.6

[Christian Grothoff]

Dear libextractor community,

I just wanted  all of you to know that I've recently made some rather radical 
changes to the GNU libextractor API in SVN HEAD which breaks all of the 
language bindings and all other code using GNU libextractor.  I didn't do this 
lightly, but we had been maintaining API compatibility since version 0.0.0 
(for almost 7 years!), and it was really time to fix the known issues / 
serious limitations.  The new version of GNU libextractor with the improved 
API will be 0.6 and I'll describe the advantages of the new API in more detail 
when 0.6.0 is to be released.

If you care about the API and have any suggestions for further changes, this 
would be the best time to voice them.  You can find the API at 

     https://ng.gnunet.org/svn/Extractor/src/include/extractor.h

Also, the various language bindings (Python, PHP, mono, perl, ...) will need 
to be updated.  I've already myself converted the Java binding; for the others 
I hope the original authors or new contributors will help with this task.  
Adapting the Java binding to the new API took less than 2h (including 
testing).

Note that LE 0.6.0 has not yet been released --- I still need to update the 
documentation and finish up some other minor issues (such as integrating 
feedback I have already received about the new API).  Other than missing 
documentation, the code in SVN HEAD itself should be reasonably ready for 
production and testing.  

Again, if anyone wants to provide any feedback about the new API, this would 
be the time to do this.

Happy hacking!

Christian