On branch master
 Changes to be committed:
	modified:   read_syntax_testing/read_syntax_test.ml
    Changed it to use the Writer from sexpIO.

	modified:   read_testing/read_test.ml
    Changed it to use the Writer from sexpIO.

	modified:   sexpIO.ml
    Implemented a write function.

	modified:   sexpIO.mli
    Implemented a write function.