Conditional targets

[David Philippi]

I've just wrote a little script checking every .cxx for unrequired includes. 
Like one can see in the CVS mails there were quite a lot of them.
Doing the removal I've got the following question: how many #ifdef featureX 
are there? I didn't remove any headers related to gettext, since it's not 
activated for me AFAIK. Question is - how many special builds did I break?

I think a list of all combinations should be made at latest short before the 
next version is released to ensure that pingus compiles in all supported 
variations but it wouldn't hurt to have one before. ;-)

Bye David