
Post or update a comment.

Parameters:
    author: the name of the account authoring the comment (type: const
	string &)
    permlink: the accountwide unique permlink for the comment (type: const
	string &)
    parent_author: can be null if this is a top level comment (type: const
	string &)
    parent_permlink: becomes category if parent_author is "" (type: const
	string &)
    title: the title of the comment (type: const string &)
    body: the body of the comment (type: const string &)
    json: the json metadata of the comment (type: const string &)
    broadcast: true if you wish to broadcast the transaction (type: bool)
