various fixes to hopefully compile under win32
remove a few unused things for win, but we have more bugs after ..
resolve cmakelists conflict

Conflicts:
	examples/simdag/CMakeLists.txt
several changes in the way cmake handles windows
rename main function for windows
small fixes to repair unix build
bug : smpi tracing options were replacing those the user had set
small change for smpi win
force lib names to stop changing when activating smpi on windows
add smpi to windows installer
change name of the real executed main function to a windows specific one
change an include, to avoid linking from simgrid to smpi