simple.el (next-error-buffer-p): allow for inclusive and

simple.el (next-error-buffer-p): allow for inclusive and
exclusive tests for finding a buffer
(next-error-find-buffer): pass the exclusive and inclusive tests
to next-error-buffer-p

replace.el (occur-next-error): switch to the Occur buffer when
appropriate, and use the exclusive filter to
next-error-find-buffer to do it.  Use the absolute value of the
motion amount.