make it compile under MSN vc. Unfortunately it has a weird crash at boot :(

- Lots of indenting changes
- VC++ is strict with variadic macros
- VC++ does not accept unistd.h
- new interface for walltime
- VC++ does not seem to have support for integer overflow.
- VC++ defines YENV_REG?
- no access flags, x permissions ignored.
- new FindGMP supporting MPIR
- make horus optional (c++ is hard).

packages/CLPBN/CMakeLists.txt

@@ -89,7 +89,9 @@ set(
   ex/learning/train.yap
   )
 
+IF (WITH_HORUS)
 add_subDIRECTORY (horus)
+ENDIF()
 
 install(FILES
   ${CLPBN_TOP}