add options -safe-string and -unsafe-string to the compilers and toplevel

git-svn-id: http://caml.inria.fr/svn/ocamldoc/trunk@14706 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
fix white space

git-svn-id: http://caml.inria.fr/svn/ocamldoc/trunk@14707 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
remove camlp4

git-svn-id: http://caml.inria.fr/svn/ocamldoc/trunk@14708 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02