Details of this changes:

src/msg/private.h
		export msg_global for MSG4C++
		extern C for C compatibility on C++ compilers
		renaming using fields in refcount

src/msg/mailbox.c
src/msg/task.c
src/msg/gos.c
src/xbt/xbt_sg_synchro.c
src/simix/private.h
src/simix/smx_synchro.c
src/include/surf/surf.h
src/surf/cpu.c
src/surf/network.c
src/surf/workstation_ptask_L07.c
src/surf/network_constant.c

		renaming using fields in refcount

src/msg/mailbox.h
		export some mailbox functions for MSG4C++

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@5861 48e7efb5-ca39-0410-a469-dd3cf9ba447f