hgweb: fix up trailing slash detection on Python 3 Fixes a couple of hgweb tests. Differential Revision: https://phab.mercurial-scm.org/D2661

hgweb: convert req.form to bytes for all keys and values This is just going to be a lot cleaner for our internals. Differential Revision: https://phab.mercurial-scm.org/D2660

templater: show repr of string we're rejecting I feel like this should make it a little easier to hunt down problems. Differential Revision: https://phab.mercurial-scm.org/D2659

webutil: some %d instead of %s love on ints Differential Revision: https://phab.mercurial-scm.org/D2658

py3: whitelist three more cases Differential Revision: https://phab.mercurial-scm.org/D2657

archival: our filenames are bytes, not strs Differential Revision: https://phab.mercurial-scm.org/D2656

archival: tar file modes need to be sysstrs Differential Revision: https://phab.mercurial-scm.org/D2655

archival: fsdecode paths before passing to tar or zip objects Both of these traffic in unicodes for filenames on Python 3, and inspection of the tarfile module shows that it uses the filesystem encoding, so fsdecode is the right choice. Differential Revision: https://phab.mercurial-scm.org/D2654

py3: add b'' prefixes in tests/test-minirst.py # skip-blame because just b'' prefixes Differential Revision: https://phab.mercurial-scm.org/D2653

py3: make sure __repr__ returns a str # skip-blame because just r'' prefix Differential Revision: https://phab.mercurial-scm.org/D2652