wireproto: chunking and compression is forthwith to be handled by hgweb Various functions disappeared in the process. Use the new streamres API but fall back to the old way if the keyword arguments are not accepted. See https://www.mercurial-scm.org/repo/hg/rev/2add671bf55b

readme: fix the test run command As we use the run-tests.py in Mercurial, we do not need to specify the path to a Mercurial utility.