Add support for gtk-doc annotations for allow-none. Add test case.

2008-06-20  Johan Dahlin  <jdahlin@async.com.br>

    * giscanner/ast.py:
    * giscanner/girwriter.py:
    * giscanner/transformer.py:
    * tests/parser/Foo-expected.gir:
    * tests/parser/foo-object.h:
    * tests/parser/foo.c (foo_object_allow_none):
    Add support for gtk-doc annotations for allow-none.
    Add test case.


svn path=/trunk/; revision=291