tests: port test-glog.t to Python 3 by using extracted printrevset Differential Revision: https://phab.mercurial-scm.org/D4252

tests: extract printrevset extension from test-glog-beautifygraph.t Differential Revision: https://phab.mercurial-scm.org/D4251

tests: add missing b'' prefix in test-check-code.t It now passes on Python 3. # skip-blame b prefix Differential Revision: https://phab.mercurial-scm.org/D4250

contrib: have check-code look at files in latin1 instead of ascii This way all files open. So far none of our patterns look like they'll care. Differential Revision: https://phab.mercurial-scm.org/D4249

tests: port inline extension in test for beautifygraph to Python 3 test-glog-beautifygraph.t now passes on Python 3. Differential Revision: https://phab.mercurial-scm.org/D4247

beautifygraph: use slicing instead of subscripting on bytestr Differential Revision: https://phab.mercurial-scm.org/D4246

beautifygraph: use sysstr for checking encoding._wide # skip-blame just an r prefix Differential Revision: https://phab.mercurial-scm.org/D4245

stringutil: have buildrepr delegate to pprint for unknown types This stabilizes some revset reprs across Python 2 and 3. Differential Revision: https://phab.mercurial-scm.org/D4244

stringutil: teach pprint about sets This is the old (Python 2) way of printing sets. I actually prefer the Python 3 version of the repr, but this will result in less test churn in the short term. Differential Revision: https://phab.mercurial-scm.org/D4243

parser: replace bespoke _brepr with stringutil.pprint Differential Revision: https://phab.mercurial-scm.org/D4242