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.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.