[nre] adjusted SConscript for clang.
Fixed type-problem for clang.
Fixed warnings detected by clang.
Inline asm is broken for clang, use __builtin instead.
Added missing (VMM_)MEMORY_BARRIER define.
Fixed type-error in net.h (unsigned vs. size_t).
Added missing include of emmintrin.h.
[nre] Added network support.
[nre] Print information about guest-memory.
Use builtins for bswap. Enable bswap on x86-64.