Remove c:errors

We currently say that the error port of a catch will return a c:errors
document containing one or more c:error elements. I think this is a
mistake. I think we should say simply that a sequence of one or more
c:error documents appears on the error port.

Given that different steps can generate error messages, it's a real
burden to make sure that they're all wrapped in a single c:errors
element. And the extra work doesn't seem to have any benefits.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | We humans are such limited
http://nwalsh.com/            | creatures--how is it that there are so
                              | few limits when it comes to human
                              | suffering?--Pierre Marivaux