[Gvsig_english] installing non-supported extensions on gvSIG for OS X

[Mijail]

gvSIG's extensions are usually installed with an installer made with  
IzPack, which does not work correctly with OS X's bundles. That  
usually means that Mac users have to wait until a special installer  
is crafted for them, so sometimes they miss the fun while waiting for  
official support.

So here we have a little applet that will help them out. This  
application will create an auxiliar folder, just next to the selected  
gvSIG, that IzPack installers will accept to intall to; the magic  
thing is, the extension will really get installed into gvSIG.
So your only problem now is to find a IzPack installer that can be  
run on OS X. The ones finishing in .jar are OK. The .jar can also be  
extracted from the .bin Linux installers if you know a bit about  
shell scripting.

Now, there are some limitations:
-- Remember, this is a hack to be able to try and play with new  
things while waiting for official support. That is, THIS IS NOT  
SUPPORTED. If you use this way of installing an extension, weird  
errors could happen, and we won't be able to help you out in the mail  
lists.
-- This can only work with pure java extensions: no native libraries  
can be used. SEXTANTE is a good example of an interesting extension  
which does not use native libraries and whose unstable versions are  
published with a .jar installer, so it is a great candidate to be  
used with this hack.

This should be a stopgap while we find a better way of dealing with  
IzPack and/or "native" installers on OS X. We'll keep you posted. In  
the meantime, feedback will be welcome.

Cheers!
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