wsgiheaders: make sure __repr__() returns a string When printing `req.headers` on the server side to debug, it complained that '%b' needed to take a string, not bytes. Changing '%s' to '%r' caused it to complain that __repr__ didn't return a string.

tests: add code to handle HTTP digests on the server side It's not hooked up yet. Mostly this was cargoculted and simplified from some python.org code[1]. It's not trying to test the security as much as it is trying to make sure that clients are sending out the right data when challenged. (And they aren't on py3.) [1] http://svn.python.org/projects/sandbox/trunk/digestauth/digestauth.py

run-tests: allow spaces in the --view tool Most tools on Windows are in Program Files, and not necessarily on PATH.

tests: extract the http server authentication extension to a single module We had 4 copy/pastes of this, and no coverage for http digests (which are currently broken on py3).

extdiff: support tools that can be run simultaneously

subrepo: avoid false unsafe path detection on Windows Subrepo paths are not normalized for the OS, so what was happening in the subsequent root path check was: root -> $TESTTMP\issue1852a\sub/repo util.expandpath(...) -> $TESTTMP\issue1852a\sub/repo os.path.realpath(...) -> $TESTTMP\issue1852a\sub\repo