- No #ifdef WITH_LIBCORE anymore in backend, compilation without libcore was broken anyway so we always require it now
- changed some #include "config.h" to the recommended #include <config.h>

- New register allocator modules can register themselfes in a list now,
	the same will be done for spillers, copy coalescers, architectures soon

- Fixes for compilation without DEBUG_libfirm
- Fixed for compilation without WITH_LIBCORE (but it's still broken)

- refactored backend to store some analysis info about the irg in the be_irg structure, added assure_ and invalidate_ functions for this

made code more firm style :)

added comments (especially for endif)

warning removed

  both try to transform as many jumps as possible to fallthroughs (weighted by
  execution frequency). The results are most of the times better than the extbb
  blockscheduler.
  Though it seems like x86 branch prediction sees conditional backward
  jumps as always taken, so we have to make sure that for 50/50 jumps we don't
  create backward jumps. (nothing implemented for this yet)