bump to kh31

The main changes are listed below but there is a lot of noise from behind the scenes
work like quicker stats updates, code re-arranging and infrequent used code like the
allocation code which is not usually compiled in.

Implement scatter-gather IO, initially for flv wrapping as that will make a lot of
use of it and should save a lot of memory copies. The icy metadata should also be a
candidate for this.

Add better handling to relays with multiple servers and fallbacks. Problem entries
can be skipped when restarting. 

Fixup build system for mingw32 cross compile. VC was getting too annoying but should
still be an option if needed later.  This now allows us to build with newer dependent
libs without much extra work.   The GUI component is not built now (VC specific) but
it was of limited use and most win32 users configure the service.



svn path=/icecast/branches/kh/icecast/; revision=18147