fixes problems with ">>" generated in nested C++ templates

    at least clang-503-0.40 refused to compile experssions like
    "std::vector<OpenMS::DRange<2>>" because of the ">>" at the end.
    This commit fixed this by creating the easier to parse
    form std::vector<OpenMS::DRange<2> >"
Merge pull request #1000 from uweschmitt/pyopenms_fix_template_problem

fixes problems with ">>" generated in nested C++ templates