Creates and populates the Misc/NEWS.d directory tree.

def populate():
    """
Creates and populates the Misc/NEWS.d directory tree.
    """
    os.chdir("Misc")
    safe_mkdir("NEWS.d/next")

    for section in sections:
        dir_name = sanitize_section(section)
        dir_path = f("NEWS.d/next/{dir_name}")
        safe_mkdir(dir_path)
        readme_path = f("NEWS.d/next/{dir_name}/README.rst")
        with open(readme_path, "wt", encoding="utf-8") as readme:
            readme.write(f("Put news entry ``blurb`` files for the *{section}* section in this directory.\n"))
        git_add_files.append(dir_path)
        git_add_files.append(readme_path)
    flush_git_add_files()