This change makes a few improvements in

TestCase.create_review_request(), from functionality to organization

to documentation.
A few arguments (bugs_closed, commit_id, changenum, public) have

been removed in favor of a catch-all **kwargs, which can be used to

set any attribute on the model.
A new argument, depends_on, was added to make it easier to specify

dependencies of a review request when creating the review request.
The rest of the arguments have been reorganized a bit to help keep them

maintainable. Flags affecting the creation operation

(with_local_site, create_repository, publish) are now grouped

together as the first arguments. Following that are the fields for the

models that contain defaults, somewhat organized by purpose/type (IDs,

parent objects, fields, Many-to-Many values).
All arguments have been documented with the modern doc conventions.

Unit tests pass.
Used the new depends_on in an upcoming change.